Hospital Separation Rates Research Articles

Age at first alcohol-related hospital separation or emergency department presentation and rate of re-admission: A retrospective data linkage cohort of young Australians.

Alcohol is a leading risk factor for death and disease in young people. We compare age-specific characteristics of young people who experience their first ('index') alcohol-related hospitalisation or emergency department (ED) presentation, and whether age at index predicts 12-month rates of readmission. We used a retrospective linked-data cohort of 10,300 people aged 12-20 years with an index alcohol-related hospital and/or ED record in New South Wales, Australia from 2005 to 2013. Age group (early adolescent [12-14 years], late adolescent [15-17 years], young adult [18-20 years]) and diagnosis fields were used in logistic regression analyses and to calculate incidence rates with adjustment for year of index event, sex, socioeconomic disadvantage and residence remoteness. People who experienced their index event in early adolescence (adjusted relative risk ratio [ARRR] 0.45 [95% confidence interval 0.39, 0.52]) or late adolescence (ARRR 0.82 [0.74, 0.90]) were less likely to be male compared to young adults. Early adolescents (ARRR 0.60 [0.51, 0.70]) and late adolescents (ARRR 0.84 [0.76, 0.93]) were less likely to have a hospitalisation index event. Early adolescents (adjusted incidence rate ratio 1.40 [1.15, 1.71]) and late adolescents (adjusted incidence rate ratio 1.16 [1.01, 1.34]) were more likely than young adults to have a subsequent 12-month non-poisoning injury ED presentation. We identified preventable hospital events in young people who have previously experienced an alcohol-related ED presentation or hospitalisation, with age-specific characteristics and outcomes that can be used to inform future health policy and service planning.

Epidemiology of Hospital Admissions for Craniosynostosis in Australia: A Population-Based Study.

To describe trends, age, and sex-specific patterns of population hospital admissions with a diagnosis of craniosynostosis (CS) in Australia. Population data for hospital separations (in-patient) from public and private hospitals (July 1996-June 2018) were obtained from the publicly available Australian Institute of Health and Welfare (AIHW) National Hospital Morbidity Database. The outcome variables were hospital separation rates (HSR) (number of hospital separations divided by the estimated resident population [ERP] per year) and average length of stay (aLOS) (patient days divided by the number of hospital separations) with a diagnosis of CS. Trends in HSR and aLOS adjusted for age, sex, and type of CS were investigated by negative binomial regression presented as annual percent change (APC). In 8057 admissions identified, we observed no significant change in the annual trend for HSR for the 22-year period. However, a marginal annual decrease of 1.6% (95% CI: -0.7, -2.4) in the aLOS was identified for the same time period. HSR were higher for males, infants, and single suture synostosis. aLOS was 3.8 days (95% CI: 3.8, 3.9) per visit, longer for syndromic conditions. There was a minor reduction in the average length of hospital stay for CS over the 22-year period potentially indicative of improved care. Population-level information on hospitalisations for rare craniofacial conditions can inform research, clinical, and surgical practice.

Description of Total Population Hospital Admissions for Treacher Collins Syndrome in Australia.

To describe patterns and demographic characteristics of total-population hospital admissions with a diagnosis of Treacher Collins syndrome (TCS) in Australia. Population summary data for inpatient hospitals admissions (public and private) with a principal diagnosis of TCS (ICD10-AM-Q87.04) were obtained from the Australian Institute of Health and Welfare National Hospital Morbidity Database for a 11-year period (2002-2013). The primary outcome was hospital separation rate (HSR), calculated by dividing the number of hospital separations by estimated resident population per year. Trends in HSR s adjusted for age and sex were investigated by negative binomial regression presented as annual percent change and the association of rates with age and sex was expressed as incidence rate ratio. In 244 admissions identified, we observed an increase of 4.55% (95% confidence interval [CI] -1.78, 11.29) in HSR's over the 11-year period. Rates were higher during infancy (1.87 [95% CI 1.42, 2.42]), declining markedly with increasing age. The average length of hospital stay was 6.09 days (95% CI 5.78, 6.40) per episode, but longer for females and infants. Findings indicate an increase in hospitalization rates, especially among infants and females which potentially relates to early airway intervention procedures possibly influenced by sex specific-disease severity and phenotypic variability of TCS. Awareness of the TCS phenotype and improved access to genetic testing may support more personalized and efficient care. Total-population administrative data offers a potential to better understand the health burden of rare craniofacial diseases.

The association of material deprivation component measures with injury hospital separations in British Columbia, Canada

BackgroundThis study examines social disparities across neighbourhood levels of income, education and employment in relation to overall injury hospital separations in the province of British Columbia, Canada. Further, the study examines the relationships of social disparities to a set of three injury prevention priorities in British Columbia, namely, transport (motor vehicle occupant, pedestrian and cyclist), falls among older adults, and youth self-harm. The goal being to better understand area-based injury incidence with a view to precision prevention initiatives, particularly for more vulnerable populations.MethodsAcute hospital separations from the Discharge Database were identified for all causes of injury and the three BC injury prevention priorities for the period April 1, 2009 to March 31, 2014, inclusive. An ecological approach was applied where each hospital separation case was attributed with the income, education and employment level according to the injured individual’s area of residence, derived from the 2011 CensusPlus data.ResultsInjury hospital separation data were available for 191 Forward Sortation Areas in BC. Between April 1, 2009 and March 31, 2014, there was a total of 177,861 injury-related hospital separations, averaging 35,572 hospital separations per year and an annual rate of 779 injury hospital separations per 100,000 population. Injury hospital separation rates varied with the measured neighbourhood area socioeconomic status variables. Injury hospital separation rates demonstrated an inverse relationship with neighbourhood levels of income and education. Neighbourhood area socioeconomic status differences were also associated with the injury hospital separation rates for falls among older adults, motor vehicle crashes involving motor vehicle occupants, pedestrians, cyclists and young drivers, and youth self-harm.ConclusionsThe study results show that neighbourhood levels of income, education and employment are associated with the risk of injury hospital separation. In particular, low education levels in FSAs was associated with increased risk of injury hospital separation, mainly for motor vehicle occupants, pedestrians, young drivers, and youth self-harm. The results of this study provide useful information for implementing injury prevention initiatives and interventions in BC to align with the provincial public health system and road safety strategy goals, particularly for identified priorities.

Perioperative outcomes and risk assessment in dialysis patients: current knowledge and future directions.

Perioperative medicine is rapidly emerging as a key discipline to address the specific needs of high-risk surgical groups, such as those on chronic dialysis. Crude hospital separation rates for chronic dialysis patients are considerably higher than patients with normal renal function, with up to 15% of admission being related to surgical intervention. Dialysis dependency carries substantial mortality and morbidity risk compared to patients with normal renal function. This group of patients has a high comorbid burden and complex medical need, making accurate perioperative planning essential. Existing perioperative risk assessment tools are unvalidated in chronic dialysis patients. Furthermore, they fail to incorporate important dialysis treatment-related characteristics that could potentially influence perioperative outcomes. There is a dearth of information on perioperative outcomes of Australasian dialysis patients. Current perioperative outcome estimates stem predominantly from North American literature; however, the generalisability of these findings is limited, as the survival of North American dialysis patients is significantly inferior to their Australasian counterparts and potentially confounds reported perioperative outcomes; let alone regional variation in surgical indication and technique. We propose that data linkage between high-quality national registries will provide more complete data with more detailed patient and procedural information to allow for more informative analyses to develop and validate dialysis-specific risk assessment tools.

Asthma hospitalisation trends from 2010 to 2015: variation among rural and metropolitan Australians

BackgroundAsthma remains a leading cause of illness, where primary care can assist to reduce hospitalisations through prevention, controlling acute episodes, and overall management of asthma. In Victoria, Asthma hospitalisations were as high as 3.1 hospitalisations per 1000 population in 1993–94. The primary aims of this study are to: determine if changes in asthma hospitalisations have occurred between 2010 and 2015; determine the key factors that impact asthma hospitalisation over time; and verify whether rural and urban asthma hospitalisations are disparate. A secondary aim of the study is to compare 2010–2015 results with asthma data prior to 2010.MethodsHospital separation data from 1 July 2010 to 30 June 2015 were obtained through the Victorian Admitted Episodes Dataset and other agencies. Data included sex, age, Local Government Area, private or public patient, length of stay, and type of discharge. Asthma and predictor variables were analysed according to hospital separation rates after adjusting for smoking and sex. Hierarchical multiple regression examined the association between asthma and predictor variables.ResultsDuring the study period, 49,529 asthma hospital separations occurred, of which 77.5% were in metropolitan hospitals, 55.4% hospital separations were aged 0–14 years, and 21.7% were privately funded. State-wide hospital separations were 1.85 per 1000 population and were consistently higher in metropolitan compared to rural areas (1.93 vs 1.64 per 1000 population). When data among metropolitan adults aged 15 and over were analysed, an increase in the proportion of smokers in the population was reflected by an increase in the number of hospital separations (Adj OR 1.035). Further, among rural and metropolitan children aged 0–14 the only predictor of asthma hospital separations was sex, where metropolitan male children had higher odds of separation than metropolitan females of the same age (Adj OR 4.297). There was no statistically meaningful difference for separation rates between males and females in rural areas.ConclusionsWe demonstrated a higher overall hospital separation rate in metropolitan Victoria. For children in metropolitan areas, males were hospitalised at higher rates than females, while the inverse was demonstrated for children residing in rural areas. Therefore, optimising asthma management requires consideration of the patient’s age, gender and residential context. Primary health care may play a leading role in increasing health literacy for patients in order to improve self-management and health-seeking behaviour.

A prospective cohort study of hospital separations among people who inject drugs in Australia: 2008–2013

ObjectivesInjecting drug use is a persistent behaviour that increases the risk of morbidities and mortality. We assessed the burden of hospital separations among people who inject drugs (PWID), the excess...

Estimating the Annual Number of Strokes and the Issue of Imperfect Data: An Example from Australia

Estimates of strokes in Australia are typically obtained using 1996-1997 age-specific attack rates from the pilot North East Melbourne Stroke Incidence (NEMESIS) Study (eight postcode regions). Declining hospitalizations for stroke indicate the potential to overestimate cases. To illustrate how current methods may potentially overestimate the number of strokes in Australia. Hospital separations data (primary discharge ICD10 codes I60 to I64) and three stroke projection models were compared. Each model had age- and gender-specific attack rates from the NEMESIS study applied to the 2003 population. One model used the 2003 Burden of Disease approach where the ratio of the 1996-1997 NEMESIS study incidence to hospital separation rate in the same year was adjusted by the 2002/2003 hospital separation rate within the same geographic region using relevant ICD-primary diagnosis codes. Hospital separations data were inflated by 12·1% to account for nonhospitalized stroke, while the Burden of Disease model was inflated by 27·6% to account for recurrent stroke events in that year. The third model used 1997-1999 attack rates from the larger 22-postcode NEMESIS study region. In 2003, Australian hospitalizations for stroke (I60 to I64) were 33,022, and extrapolation to all stroke (hospitalized and nonhospitalized) was 37,568. Applying NEMESIS study attack rates to the 2003 Australian population, 50,731 strokes were projected. Fewer cases for 2003 were estimated with the Burden of Disease model (28,364) and 22-postcode NEMESIS study rates (41,332). Estimating the number of strokes in a country can be highly variable depending on the recency of data, the type of data available, and the methods used.

Trends in pulmonary embolism morbidity and mortality in Australia

IntroductionPulmonary embolism (PE) is a common cause of morbidity and mortality. In this study, we investigated patterns of morbidity and mortality from PE in Australia. Materials & MethodsAustralian government databases were used to extract data on age and sex specific rates of mortality between 1997 and 2007, and hospital separations between 1998/9 and 2009/10 to examine changes over time and between age and sex groups. ResultsIn 2007, 320 deaths were ascribed to PE in Australia, corresponding to a mortality rate of 1.73 per 100 000 population per year. Between 1997 and 2007, the Australian mortality rate decreased in both sexes, but this was significant only in females. By comparison, in 2009/10 there were 9,847 hospital separations for PE, corresponding to a rate of 53.1 per 100 000 population per year. In contrast to the fall in mortality rates, hospital separation rates significantly increased over the study period. Females had higher rates of morbidity and mortality from PE than males. While the mortality rates among the elderly population decreased significantly (from 48.4 to 34.3 per 100 000 population per year in those aged over 85 years), there were significant increases in PE mortality in the younger female age groups. ConclusionsAlthough mortality rates are decreasing, PE remains a significant cause of morbidity and mortality in Australia, especially in females and the elderly. The burden of morbidity and mortality from PE in Australia is comparable to that found in America and a number of European countries.

HEALTH STATUS AND SERVICE USE IN HOMELESS INDIVIDUALS WITH MENTAL ILLNESS: CONSISTENCY BETWEEN SELF-REPORT AND ADMINISTRATIVE HEALTH RECORDS IN THE AT HOME/CHEZ SOI MULTI-SITE TRIAL

ObjectiveHomeless individuals with poor health frequently use healthcare services. However, studies using self-reported data may be subject to biases. We examined health status, healthcare and drug use among mentally ill...

Morbidity burden of end‐stage kidney disease in Australia: Hospital separation rates among people receiving kidney replacement therapy

Mortality associated with dialysis and transplantation is well characterized. Less well described are hospital separation rates for "non-renal" diagnoses among people receiving kidney replacement therapy (KRT = haemodialysis, peritoneal dialysis and kidney transplantation). We examined these rates among Australians receiving KRT. Observational study based on Australian National Hospital Morbidity Database, incorporating Australian public and private hospitals. Separations from this dataset were examined for 2002-7, excluding day-only haemodialysis. ICD (International Classification of Disease) codes were used to identify separations for people receiving chronic KRT. Separations categorized into "renal" and "non-renal" by principal diagnosis. Separation rate, admission length and in-hospital mortality were compared with the general population. Overall hospital separation rate (adjusted for age and gender) was increased relative to the general population for all groups: for HD patients, relative rate (RR) was 4.49 [95% confidence interval 4.460-4.53]; for PD patients 5.52 [5.460-5.59]; for transplant recipients 4.83 [4.20-4.28] (all p < 0.001). When restricted to separations with a "non-renal" principal diagnosis, the excess remained among KRT groups: HD adjusted RR 2.20 [2.170-2.22], PD 2.00 [1.950-2.04] and transplants 2.63 [2.600-2.66], all p < 0.001). The length and in-hospital mortality for separations in each KRT group was also increased. By ICD-10 chapter, rates of separations with infectious and metabolic causes were increased in all KRT groups; separations with circulatory and respiratory causes were also increased. Among people receiving KRT in Australia, there is a substantial burden of morbidity in addition to that directly related to KRT. This is most marked for infective, endocrine and circulatory and respiratory hospitalisations.

The impact of socio-economic disadvantage on rates of hospital separations for diabetes-related foot disease in Victoria, Australia.

BackgroundInformation describing variation in health outcomes for individuals with diabetes related foot disease, across socioeconomic strata is lacking. The aim of this study was to investigate variation in rates of hospital separations for diabetes related foot disease and the relationship with levels of social advantage and disadvantage.MethodsUsing the Index of Relative Socioeconomic Disadvantage (IRSD) each local government area (LGA) across Victoria was ranked from most to least disadvantaged. Those LGAs ranked at the lowest end of the scale and therefore at greater disadvantage (Group D) were compared with those at the highest end of the scale (Group A), in terms of total and per capita hospital separations for peripheral neuropathy, peripheral vascular disease, foot ulceration, cellulitis and osteomyelitis and amputation. Hospital separations data were compiled from the Victorian Admitted Episodes Database.ResultsTotal and per capita separations were 2,268 (75.3/1,000 with diabetes) and 2,734 (62.3/1,000 with diabetes) for Group D and Group A respectively. Most notable variation was for foot ulceration (Group D, 18.1/1,000 versus Group A, 12.7/1,000, rate ratio 1.4, 95% CI 1.3, 1.6) and below knee amputation (Group D 7.4/1,000 versus Group A 4.1/1,000, rate ratio 1.8, 95% CI 1.5, 2.2). Males recorded a greater overall number of hospital separations across both socioeconomic strata with 66.2% of all separations for Group D and 81.0% of all separations for Group A recorded by males. However, when comparing mean age, males from Group D tended to be younger compared with males from Group A (mean age; 53.0 years versus 68.7 years).ConclusionVariation appears to exist for hospital separations for diabetes related foot disease across socioeconomic strata. Specific strategies should be incorporated into health policy and planning to combat disparities between health outcomes and social status.

Diabetes related foot disease; ‘know thine enemy’

Background Information describing variation in health outcomes for individuals with diabetes related foot disease (DRFD), across socioeconomic strata is lacking. Focussing on the clinical aspects of foot disease, in individuals with DRFD that reside in areas of known social disadvantage, may not result in the desired clinical outcomes. The aim of this study was to investigate variation in rates of hospital separations for DRFD and the relationship with levels of social advantage and disadvantage.

The relationship between alcohol problems, perceived risks and attitudes toward alcohol policy in Canada

Approval of alcohol policies by the public in democratic countries is critical for instituting social change. With respect to alcohol policies, mounting research indicates that a higher price per unit of ethanol is an effective approach for reducing alcohol-related problems, yet surveys have found this approach is usually unpopular. The purpose of this paper is to assess the relationship between amount of drinking and support for various alcohol policies. A secondary analysis was conducted on the Canadian Addictions Survey, a randomised telephone survey of over 10 000 Canadians. The relationship between the amounts of drinking reported by the respondents was examined in relation to the perceived seriousness of alcohol problems in their communities and the endorsement of several alcohol policies. Increased amount of drinking was significantly related to lower perceptions of drinking-related risks. Furthermore, heavier consumers had less favourable attitudes than lighter drinkers and abstainers toward alcohol policies, such as increased taxation. Aggregated data across the 10 Canadian provinces showed a strong effect size (r = -0.515, P = 0.128) between endorsement of alcohol taxation and rates of hospital separations for alcohol. Results from this study show that the more that people drink, the more they oppose taxation. The implications of these findings are that as alcohol problems in communities become worse, the population may become more resistant to effective alcohol policies. Strategies are suggested for implementing effective policies.

Psychiatric services for the “old” old

Few studies have specifically examined mental health service delivery to persons aged over 84 years, often described as the "old" old. Our aim was to compare mental health service provision in Australia to persons aged 85 years and over with the "young" old and other age groups. We hypothesized that the "old" old would differ from the "young" old (65-84 years) by diagnostic category, rates of specialist psychiatric hospital admission, and use of Medicare funded psychiatric consultations in the community. Mental health service delivery data for 2001-02 to 2005-06 was obtained from Medicare Australia on consultant psychiatrist office-based, home visit and private hospital services subsidized by the national healthcare program and the National Hospital Morbidity database for separations (admitted episodes of patient care) from all public and most private hospitals in Australia on measures of age, gender, psychiatric diagnosis, location and type of psychiatric care. Use of specialist psychiatric services in the community per annum per 1000 persons declined with age in men and women from 137.28 and 191.87 respectively in those aged 20-64 years to 11.84 and 14.76 respectively in those over 84 years. However, men and women over 84 years received psychiatric home visits at 377% and 472% respectively of the rates of persons under 65. The annual hospital separation rate per 1000 persons for specialist psychiatric care was lowest in those aged over 84 (3.98) but for inpatient non-specialized psychiatric care was highest in those over 84 (21.20). Depression was the most common diagnosis in specialized psychiatric hospitalization in those aged over 84 while organic disorders predominated in non-specialized care in each age group over 64 years with the highest rates in those aged over 84. Mental health service delivery to persons aged over 84 is distinctly different to that provided to other aged groups being largely provided in non-specialist hospital and residential settings.

Baseline indicators for measuring progress in preventing falls injury in older people

Over recent years, there has been increasing attention given to preventing falls and falls injury in older people through policy and other initiatives. This paper presents a baseline set of fall injury outcome indicators against which these preventive efforts can be assessed in terms of monitoring the rate of fall-related deaths and hospitalisations. ICD-10-AM coded hospital separations, Australian Bureau of Statistics (ABS) mortality and ABS population data were used to determine the rate of fall-related injury mortality and hospitalisations occurring in people aged 65+ years in New South Wales (NSW), Australia, over the six-year period from 1998/99 to 2003/04, inclusive. Baseline trends for one fatality and five separations-based metrics are presented. Overall, fall mortality rates increased over the six years, with higher rates in males. Falls hospitalisation rates also increased slightly, with higher rates in females. The rates of hip fracture and pelvic fracture hospital separations generally declined over the six years and were highest in females. The level of unspecified and missing information about the place where falls occur increased by 1.5%. Baseline trends in fall injury outcome metrics highlight the severity and frequency of fall injuries before wide scale implementation of the Management Policy to Reduce Fall Injury Among Older People in NSW. Future use of these metrics will help to evaluate and monitor the progress of falls prevention in older people in NSW. They could also be adopted in other jurisdictions.

Changes in the Rates of Alcohol- and Drug-related Hospital Separations for Canadian Provinces: 1996 to 2005

This paper aims to present the rates of drug-related hospital separations for amphetamines, alcohol, cocaine, cannabis and opioids for each province from fiscal years 1996 to 2005. Data were drawn from Canada's Hospital Morbidity Database, a national electronic archive of all inpatient hospital admission records. All inpatient medical records with an alcohol- or drug-related diagnosis were abstracted for this study. Canadian rates increased during the 10-year period for all drugs; however, alcohol separations declined somewhat. The highest rates of drug and alcohol separations were most often found in BC, Alberta and the North. Nova Scotia and Newfoundland generally had the lowest rates of separations. The study provides a detailed provincial and national account of alcohol- and drug-related morbidity related to inpatient hospital admissions. The rates of alcohol-related admissions across all provinces were, by far, much greater than those associated with drug-related episodes. The data provide an important measure of the harms related to substance use in Canada.

Area socioeconomic status and childhood injury morbidity in New South Wales, Australia

. Poulos R., Hayen A., Finch C. &amp; Zwi A. ( 2007 ) , 13 , 322 – 327 . DOI: 10.1136/ip.2007.015693. Objective To explore the relationship between child injury morbidity and socioeconomic status.Design A cross‐sectional analysis of routinely collected hospital separation data for unintentional injury for the period 1999/2000–2004/2005.Setting All statistical local areas of New South Wales (NSW), Australia.Subjects 110 549 unintentional injury‐related hospital separations for NSW children aged 0–14 years.Main outcome measure Adjusted incidence rate ratios (IRRs) for hospital separations for unintentional injury (for all injury and by individual injury mechanisms) by quintile of socioeconomic disadvantage for children aged 0–14 years.Results There was no clear relationship between socioeconomic status and injury when all injury mechanisms were combined. However, children in the more disadvantaged quintiles were more likely to be hospitalized than children in the least disadvantaged quintile for the following injury mechanisms: motor cycle (point estimates for IRRs across the socioeconomic status quintiles ranged from 2.95 to 4.02 relative to the least disadvantaged quintile), motor‐vehicle occupant (IRR range 1.33–2.27), pedestrian (IRR range 1.43–2.54 for ages 0–4 years), pedal cyclist (IRR range 1.30–1.50), fire and burns (IRR range 1.37–2.00), and poisoning (IRR range 1.32–1.91). Similarly, hospital separation rates for foreign body, other transport, and pedestrian (aged 5–9 years) injuries were also greater, but the differences were not statistically significant across all quintiles. These injury mechanisms accounted for about 25% of the hospital separations.Conclusions The relationship between relative socioeconomic disadvantage and injury risk in NSW children is strongest for transport‐related injuries, fires and burns, and poisoning. Interventions that address these specific injury mechanisms may help to reduce the disparity between high and lower socioeconomic groups.

Area socioeconomic status and childhood injury morbidity in New South Wales, Australia

Objective:To explore the relationship between child injury morbidity and socioeconomic status.Design:A cross-sectional analysis of routinely collected hospital separation data for unintentional injury for the period 1999/2000–2004/2005.Setting:All statistical local areas of...

Hospital separations for cannabis‐ and methamphetamine‐related psychotic episodes in Australia

To examine trends in hospital separations related to "drug-induced" psychosis for cannabis and methamphetamine, in the context of patterns of cannabis and methamphetamine use in the Australian population. Analysis of prospectively collected data from the National Hospital Morbidity Database on hospital separations primarily attributed to drug-induced psychosis (July 1993 - June 2004), and specifically for cannabis and amphetamines (1999-2004). Calculation of Australian population-adjusted rates of drug-induced psychosis hospital separations using estimated resident population data from the Australian Bureau of Statistics (at 30 June each year) and data on cannabis and methamphetamine use from the 2004 National Drug Strategy Household Survey. Number of hospital separations due to drug-induced psychosis, and standardised (age-specific) rates per million population and per million users. There have been notable increases in hospital separations due to drug-induced psychosis, which appear to have been driven by amphetamine-related rather than cannabis-related episodes. The rate of hospital separations was higher for amphetamine users than for cannabis users in all age groups, and the rate increased among older amphetamine users. The risk of hospitalisation for a drug-induced psychotic episode associated with amphetamine use appears to be greater than that for cannabis use in all age groups.