Version Of Neck Disability Index Research Articles

Cross-cultural Adaptation, Translation, and Validation of Gujarati Version of Neck Disability Index in Patients with Chronic Neck Pain

Background and Aim: Specific to the population of Gujarat state, a need arises to have neck disability index (NDI) in the regional Gujarati language. The aim of present study is to translate NDI in Gujarati language and assess its validity for use in patient care. Materials and Methods: A total of 100 patients suffering from chronic neck pain and aged between 18 and 65 years participated in the study. In phase I, translation and cross-cultural adaptation of the original English version of NDI was performed according to the published guidelines. In phase II, all the patients were asked to complete a questionnaire booklet consisting of Gujarati version of NDI (NDI-G), Neck Pain and Disability (NPAD), and Beck’s depression inventory scales. The psychometric testing included evaluation of factor structure by exploratory factor analysis, reliability by test–retest reliability and internal consistency, agreement by Bland–Altman plots and value of measurement error (standard error of measurement and minimal detectable change), construct validity by assessing hypotheses of NDI-G correlations with the Gujarati version of Neck Pain and Disability (NPAD-G) and Gujarati version of BDI (BDI-G). A panel of 15 expert members assessed the content validity of NDI-G on a 7-point Likert scale for content equivalence, content relevance, and content representativeness. Test–retest reliability for the NDI-G was examined in 50 patients, twice with an interval of 48 h. Results: In phase I, the cross-cultural adaptation process of the NDI-G was successful, and less difficulty was experienced in achieving an acceptable translation. In phase II, the NDI-G showed strong psychometric properties. The translated version of the scale showed high internal consistency (Cronbach α = 0.82) and excellent test–retest reliability (Intra-class correlation coefficient = 0.982). Face and content validity of the NDI-G was well established with no floor and ceiling effects observed. In construct validity, convergent validity was confirmed by a high correlation of NDI-G with NPAD-G (r = 0.941, P < 0.01). Conclusion: The NDI-G was successfully translated into Gujarati, showing good psychometric properties. Its use is recommended for clinical and research purposes.

Adaption and psychometric evaluation of the Hindi version of Neck Disability Index in the rural population of Northern India: A cross cultural study

Background To ensure the validity and therapeutic utility of the Neck disability index (NDI) scale, translations, cultural adaptations and psychometric evidence is necessary. This study aimed to address the absence of a suitable and validated Hindi version of the NDI for the rural population. The specific objectives were to translate, adapt, and evaluate the psychometric properties of the newly developed Hindi version of the NDI. Methods Following guidelines provided by the American Association of Orthopedic Surgeons, the original English NDI scale was cross-culturally adapted into Hindi. The adaptation process included translations (forward and backward), expert committee review, pre-testing and cognitive debriefing with 30 individuals experiencing chronic non-specific neck pain. The outcome of this process was the creation of the Hindi version of the NDI, termed NDI-Hi. Subsequently, NDI-Hi was administered to 211 participants with neck pain from multiple centers for psychometric testing. The evaluation involved test-retest reliability over a 48-hour interval, factor analysis, assessment of internal reliability measures, and criterion-related validity by comparing it with the NPAD-Hindi version. Results The NDI-Hi version exhibited favorable psychometric properties, including good test-retest reliability with an intra-class correlation coefficient (ICC) of 0.87. Internal consistency of the scale was high, indicated by Cronbach’s alpha coefficient (α) of 0.96. The standard error of measurement (SEM) was determined to be 2.58, and the minimal detectable change (MDC) was calculated to be 7.15. Furthermore, the NDI-Hi showed significant correlation with the NPAD-Hindi version, with a correlation coefficient (rho) of 0.86, and a p-value of less than 0.001. Conclusions The NDI-Hi demonstrated validity and reliability as an outcome tool for assessing neck disability. It can be effectively utilized in clinical practice and research settings involving Hindi-speaking individuals with chronic non-specific neck pain. The adapted scale is particularly well-suited for the rural Northern Indian Hindi-speaking population.

Cross-cultural adaptation and validation of the Northwick park neck pain questionnaire to Urdu language

BackgroundDespite its widespread use for assessing pain and disability in patients suffering from neck pain, the Northwick Park Neck Pain Questionnaire (NPQ) has yet to be translated and validated in Urdu. The purpose of the present study was to translate and cross-culturally adapt the NPQ into Urdu language (NPQ-U), and to investigate the NPQ-U’s psychometric properties in patients with non-specific neck pain (NSNP).MethodsThe NPQ was translated and cross-culturally adapted into Urdu in accordance with the previously described guidelines. The study included 150 NSNP patients and 50 healthy participants. The NPQ-U, Urdu version of neck disability index (NDI-U), neck pain and disability scale (NPDS), and numerical pain rating scale (NPRS) were completed by all participants on first visit. After three weeks of physical therapy, the patients completed all of the questionnaires listed above, along with the global rating of change scale. Test-retest reliability was determined on 46 randomly selected patients who completed the NPQ-U again two days after the first response. The NPQ-U was evaluated for internal consistency, content validity, construct (convergent and discriminative) validity, factor analysis, and responsiveness.ResultsThe NPQ-U demonstrated excellent test-retest reliability (intra-class correlation coefficient = 0.96) and high internal consistency (Cronbach’s alpha = 0.89). There were no floor or ceiling effects for the NPQ-U total score, indicating good content validity. A single factor was extracted, which explained 54.56% of the total variance. For convergent validity, the NPQ-U showed a strong correlation with NDI-U (r = 0.89, P < 0.001), NPDS (r = 0.71, P < 0.001), and NPRS (r = 0.73, P < 0.001). The results revealed a significant difference between patients and healthy controls in the NPQ-U total scores (P < 0.001) demonstrating significant discriminative validity. A significant difference in the NPQ-U change scores between the stable and the improved groups (P < 0.001) confirmed its responsiveness. Furthermore, the NPQ-U change score showed a moderate correlation with NPDS change score (r = 0.60, P < 0.001) and NPRS change score (r = 0.68, P < 0.001), but a strong correlation with NDI-U change score (r = 0.75, P < 0.001).ConclusionThe NPQ-U is a reliable, valid, and responsive tool for assessing neck pain and disability in Urdu-speaking patients with NSNP.

Translation and validation of the Urdu version of the neck pain and disability scale

Purpose To translate and cross-culturally adapt the neck pain and disability scale (NPDS) into Urdu language (NPDS-U), and to investigate the NPDS-U’s psychometric properties in patients with non-specific neck pain (NSNP). Methods The NPDS was translated and cross-culturally adapted into Urdu in accordance with the previously described guidelines. The study included 200 NSNP patients and 50 healthy participants. The NPDS-U, Urdu version of neck disability index (NDI-U), neck Bournemouth questionnaire (NBQ), and numerical pain rating scale (NPRS) were completed by all participants. After three weeks of physiotherapy, the patients completed all of the above-mentioned questionnaires, along with the global rating of change scale. Reliability, factor analysis, validity, and responsiveness were all tested. Results The NPDS-U demonstrated excellent test-retest reliability (ICC2,1=0.92) and high internal consistency (Cronbach’s alpha = 0.96). There were no floor or ceiling effects. A three-factor structure was extracted, which explained 70.42% of the total variance. The NPDS-U showed moderate to strong correlations with NPRS, NDI-U, and NBQ (r = 0.67–0.76, p < 0.001). A significant difference in the NPDS-U change scores between the stable and the improved groups (p < 0.001) confirmed its responsiveness. Conclusion The NPDS-U is a reliable, valid, and responsive scale for assessing neck pain and disability in Urdu-speaking patients with NSNP.

Adaption and psychometric evaluation of the Hindi version of Neck Disability Index in the rural population of Northern India: A cross cultural study.

To ensure the validity and therapeutic utility of the Neck disability index (NDI) scale, translations, cultural adaptations and psychometric evidence is necessary. This study aimed to address the absence of a suitable and validated Hindi version of the NDI for the rural population. The specific objectives were to translate, adapt, and evaluate the psychometric properties of the newly developed Hindi version of the NDI. Following guidelines provided by the American Association of Orthopedic Surgeons, the original English NDI scale was cross-culturally adapted into Hindi. The adaptation process included translations (forward and backward), expert committee review, pre-testing and cognitive debriefing with 30 individuals experiencing chronic non-specific neck pain. The outcome of this process was the creation of the Hindi version of the NDI, termed NDI-Hi. Subsequently, NDI-Hi was administered to 211 participants with neck pain from multiple centers for psychometric testing. The evaluation involved test-retest reliability over a 48-hour interval, factor analysis, assessment of internal reliability measures, and criterion-related validity by comparing it with the NPAD-Hindi version. The NDI-Hi version exhibited favorable psychometric properties, including good test-retest reliability with an intra-class correlation coefficient (ICC) of 0.87. Internal consistency of the scale was high, indicated by Cronbach's alpha coefficient (α) of 0.96. The standard error of measurement (SEM) was determined to be 2.58, and the minimal detectable change (MDC) was calculated to be 7.15. Furthermore, the NDI-Hi showed significant correlation with the NPAD-Hindi version, with a correlation coefficient (rho) of 0.86, and a p-value of less than 0.001. The NDI-Hi demonstrated validity and reliability as an outcome tool for assessing neck disability. It can be effectively utilized in clinical practice and research settings involving Hindi-speaking individuals with chronic non-specific neck pain. The adapted scale is particularly well-suited for the rural Northern Indian Hindi-speaking population.

Reliability and Validity of Cross Culturally Adapted Punjabi Version of NDI (NDI-P) in Patients with Neck Pain: A Psychometric Analysis.

Neck disability index (NDI) is one of the commonest patient-reported outcome measures used to evaluate disability related to neck pain. Its application to non-English-speaking Punjabi population is limited as a validated and cross-culturally adapted Punjabi version of NDI is not available. The purpose of the study was to analyze the psychometric properties of Punjabi version of neck disability index (NDI-P) in patients with neck pain. The translation and cross-cultural adaptation of Punjabi version of NDI was done according to well-recommended guidelines. The pre-final version was tested on a set of 15 patients and suitable modifications were made. The final version was administered to 100 patients with neck pain of more than 2weeks duration. Psychometric properties comprising internal consistency, test-re-test reliability, construct validity and factorial structure of the questionnaire were determined. The developed NDI-P showed excellent internal consistency (Chronbach alpha of NDI-P is 0.87), test-re-test reliability (ICC 0.840) and construct validity (Spearman correlation coefficient with VAS 0.547). Factor analysis proved the questionnaire to be having a 2-factor structure with a total variance of 56.58%. NDI (P) is a reliable and valid instrument for measurement of disability related to neck pain in Punjabi population. It can be used both in research and clinical care settings in future.

Response to the Comment by Özden On Our Manuscript "Cross-cultural Adaptation, Reliability, Validity and Responsiveness of the simplified-Chinese Version of Neck Disability Index".

Response to the Comment by Özden On Our Manuscript "Cross-cultural Adaptation, Reliability, Validity and Responsiveness of the simplified-Chinese Version of Neck Disability Index".

The Responsiveness of the Persian Version of Neck Disability Index and Functional Rating Index Following Physiotherapy Intervention in People with Chronic Neck Pain.

Background:Clinicians and researchers commonly use responsive outcome measures to interpret changes in a patient’s condition as a result of an intervention. This study was conducted to assess the ability of the Persian version of Neck Disability Index and Functional Rating Index to detect responsiveness in the patients with neck pain. Methods: A diagnostic accuracy study was done in Ahvaz, Iran, 2016. A convenience sample of 57 Persian-speaking patients with non-specific chronic neck pain completed the Neck Disability Index and the Functional Rating Index at the beginning and after physiotherapy intervention. The responsiveness was investigated by the receiver operating characteristics method and the correlation analysis. Statistical analysis was done using SPSS (version 21), with a P<0.05 as the level of significance. Results:The Functional Rating Index showed that the area under the curve was greater than 0.70 (range=0.651-0.942). The optimal cutoff points for the Functional Rating Index and the Neck Disability Index were 9.5 and 7.5, respectively. Gamma correlation between change scores of the Functional Rating Index and the Neck Disability Index and the Global Rating of Change Scores was 0.53 and 0.33, respectively. Conclusion:The results indicated that the Persian version of the Functional Rating Index could detect clinical changes following physiotherapy intervention in a group of patients with chronic non-specific neck pain. Therefore, we recommend that this instrument be used as a responsive measure of neck pain disability in patients with neck pain.

Cross-cultural Adaptation, Reliability, Validity, and Responsiveness of the Simplified-Chinese Version of Neck Disability Index.

Cross-cultural adaptation and psychometric evaluation. The aim of this study was to translate the Neck Disability Index (NDI) into the simplified-Chinese language and to evaluate the reliability, validity, and responsiveness of the new questionnaire. Neck pain is a major health problem resulting in major disability. NDI is the most frequently used scale for self-rating of disability due to neck pain. At present, there is no simplified-Chinese version of the NDI. The aims of this study were to culturally adapt and translate the NDI into the simplified-Chinese language (NDI-SC) and to evaluate its psychometric properties in patients with neck pain. The NDI was translated into simplified-Chinese version based on established guidelines. A total of 70 patients participated in this study. Patients were asked to complete a set of questionnaires comprising of their demographic information, the NDI-SC, and a visual analog scale (VAS) of pain. Fifty-six patients returned after 1 to 2 weeks to complete the same set of questionnaires and the global rating of change (GROC) scale. Then, the NDI-SC was evaluated for content validity, construct validity, internal consistency, test-retest reliability, and responsiveness. The NDI-SC demonstrated excellent internal consistency (Cronbach α = 0.92) and good test-retest reliability (ICC2,1 = 0.85). Content validity was confirmed as no floor or ceiling effects were detected for the NDI-SC total score. Construct validity was established with factor analysis revealing two-factor subscales explaining 66% of the variance. The NDI-SC showed a strong correlation with VAS (Rp = 0.61, P < 0.001) and a moderate correlation with GROC (Rs = 0.46, P < 0.001). The correlation between NDI-SC change scores and VAS change scores was also moderate (Rp = 0.59, P < 0.001). The results showed that the NDI-SC is a reliable, valid, and responsive instrument to measure functional limitations in patients with neck pain. 3.

Development of the Portuguese Version of the Modified Japanese Orthopaedic Association Score: Cross-Cultural Adaptation, Reliability, Validity, and Responsiveness

Spondylotic cervical myelopathy (SCM) is a common cause of spinal-related disability in elderly patients. The assessment of this disability is a challenging task and depends on the subjective evaluation of the investigator. As a widespread-used scale, the modified version of the Japanese Orthopaedic Association score (mJOA) should be translated and culturally adapted in the Brazilian Portuguese language (i.e., mJOA-Br) to provide its clinical and research use. This study aimed to perform translation, transcultural adaptation, and validation of the mJOA into Brazilian Portuguese. Following the transcultural adaptation model described by Guillemin etal., the scale as translated into Brazilian Portuguese and back-translated to English. Afterwards, questionnaires were applied in consecutive patients with SCM and compared with a control group (without SCM). The final scale was compared with the Brazilian version of Neck Disability Index for validation. Sixty patients were submitted to the translated version of mJOA. There was a strong correlation between mJOA-Br scores and Neck Disability Index scores to evaluate SCM symptoms (R=-0.75). mJOA-Br was considered a valid and reliable tool to evaluate patients with SCM.

Responsiveness of Chinese version of Neck Outcome Score in subjects with neck pain

To analyze responsiveness of Chinese version of Neck Outcome Score (NOOS-C) and provide a reliable measure to assess intervention effect for patients with neck pain. Cross-cultural adaptation of NOOS was performed according to the Beaton's guidelines for cross-cultural adaptation of self-report measures. Eighty patients with neck pain were recruited between September 2016 and May 2017. Those patients were assessed using NOOS-C and Chinese version of Neck Disability Index (NDI) before and after intervention. And 71 patients completed those questionnaires. The statistic differences of the score of each subscale and the total scale before and after intervention were evaluated by paired-samples t test. Internal responsiveness was determined by effect size (ES) and standardized response mean (SRM) based on the calculated difference before and after intervention. External responsiveness was analyzed by Spearman correlation coefficient. The differences in symptom subscale, sleep disturbance subscale, participating in everyday life subscale, every day activity and pain subscale, and the scale between before and after intervention were significant ( P<0.05) except for mobility subscale ( P>0.05). The difference of NDI-C before and after intervention was -12.11%±17.45%, ES was 0.77, and SRM was 0.69. The difference of NOOS-C before and after intervention was 13.74±17.22, ES was 0.83, and SRM was 0.80. Spearman correlation analysis revealed that the relativity about NOOS-C and NDI-C before and after intervention were both negative ( r=-0.914, P=0.000; r=-0.872, P=0.000). NOOS-C's responsiveness is good.

Early Clinical and Radiographical Results of Single Level Cervical Arthroplasty with Discocerv®

Introduction Cervical disc arthroplasty has been shown to be as effective as fusion in radiculopathy in appropriately selected patients. Discocerv(Alphatec Spine, Carlsbad, USA) was introduced to reduce the difficulty of end plate preparation. Aim of this study is to evaluate the early results of clinical and radiographic outcome in patients implanted with Discocerv, which is semiconstrained mobile prosthesis made of ceramic bearings. Material and Methods From December 2008 to June 2012, 14 patients were enrolled in this retrospective study. They all suffered from single level radiculopathy due to acute disc rupture, and underwent total disc replacement with Discocerv. The mean follow-up period was 28 months (12~60 months). There were 8 males and 6 females and the mean age was 46.9 years old (39–66). The clinical outcomes were analyzed by using preoperative and postoperative follow up Korean version of neck disability index(K-NDI) and visual analogue scale(VAS). Also segmental motion was assessed by using dynamic flexion –extension lateral view, and heterotopic ossification or other complications were assessed. Results The mean VAS score improved significantly from 8 preoperatively to 0.3, 0.6 at one year, two years respectively and mean NDI score also improved from 28 preoperatively to 9, 6.4, 8.75 at three months, one year, two years respectively after operation. The mean segmental motion was 3.2 degree preoperatively and 4.7, 4.6, 6.6 degree at postoperative six months, one year, two years respectively and after 3 years, mean segmental motion decreased to 3.1 degree and to 1.9 degree at four years. Heterotrophic ossification was not detected in all cases, but anterior osteophyte formation at implanted segment was seen in 3 cases after three years. There was no radiologic complication related to wear. But 2 patients complained subjective discomfort as if they felt friction sound of their artificial joint. Conclusion Single level cervical arthorplasty with Discocerv showed good clinical outcomes and motion preservation sustained up to postoperative 3 years. Also, there were no major complications or no heterotopic ossification. However, 14% of patients felt friction sound by themselves.

Comparison of cervical kinematics between patients with cervical artificial disc replacement and anterior cervical discectomy and fusion for cervical disc herniation

Background contextAlthough anterior cervical discectomy and fusion (ACDF) is an effective treatment option for patients with cervical disc herniation, it limits cervical range of motion, which sometimes causes discomfort and leads to biomechanical stress at neighboring segments. In contrast, cervical artificial disc replacement (ADR) is supposed to preserve normal cervical range of motion than ACDF. A biomechanical measurement is necessary to identify the advantages and clinical implications of ADR. However, literature is scarce about this topic and in those available studies, authors used the static radiological method, which cannot identify three-dimensional motion and coupled movement during motion of one axis. PurposeThe purpose of this study was to compare the clinical parameters and cervical motion by three-dimensional motion analysis between ACDF and ADR and to investigate the ability of ADR to maintain cervical kinematics. Study designThis was a prospective case control study. Patient samplePatients who underwent ADR or ACDF for the treatment of single-level cervical disc herniation. Outcome measuresVisual analog scale (VAS), Korean version of Neck Disability Index (NDI, %), and three-dimensional motion analysis were used. MethodsThe patients were evaluated by VAS and the Korean version of the NDI (%) to assess pain degree and functional status. Cervical motions were assessed by three-dimensional motion analysis in terms of sagittal, coronal, and horizontal planes. Markers of 2.5 cm in diameter were attached at frontal polar (Fpz), center (Cz), and occipital (Oz) of 10–20 system of electroencephalography, C7 spinous process, and both acromions. These evaluations were performed preoperatively and 1 month and 6 months after surgery. ResultsThe ACDF and ADR groups revealed no significant difference in VAS, NDI (%), and cervical range of motion preoperatively. After surgery, both groups showed no significant difference in VAS and NDI (%). In motion analysis, significantly more range of motion was retained in flexion and extension in the ADR group than the ACDF group at 1 month and 6 months. There was no significant difference in lateral tilt and rotation angle. In terms of coupled motion, ADR group exhibited significantly more preserved sagittal plane motion during right and left rotation and also showed significantly more preserved right lateral bending angle during right rotation than ACDF group at 1 month and 6 months. There was no significant difference in other coupled motions. ConclusionThree-dimensional motion analysis could provide useful information in an objective and quantitative way about cervical motion after surgery. In addition, it allowed us to measure not only main motion but also coupled motion in three planes. ADR demonstrated better retained cervical motion mainly in sagittal plane (flexion and extension) and better preserved coupled sagittal and coronal motion during transverse plane motion than ACDF. ADR had the advantage in that it had the ability to preserve more cervical motions after surgery than ACDF.

Cross-cultural Adaptation, Reliability, and Validity of the Arabic Version of Neck Disability Index in Patients With Neck Pain

Translation and psychometric testing. To adapt the neck disability index (NDI) cross-culturally to Arabic language and to investigate the reliability and validity of the Arabic version of NDI in an Arabic-speaking sample with neck pain. Although largely used, no previous reports exist on the translation process or the testing of the psychometric properties of the Arabic version of the NDI. Cross-cultural adaptation of an outcome questionnaire. The English version of the NDI was translated into Arabic (NDI-Ar) and back-translated according to established guidelines. Sixty-five patients with neck pain completed the NDI -Ar twice during a 1-week period, to assess its test-retest reliability. Further psychometric testing was done by assessing internal consistency, construct validity (factor structure), and responsiveness. The internal consistency value (Cronbach α) for the NDI-Ar was 0.89. The test-retest reliability (intraclass correlation coefficient) was excellent at 0.96 (95% confidence interval from 0.93 to 0.97). There was a significant correlation (r = 0.92, P < 0.05) between the scores obtained from the first administration of the NDI-Ar and the second administration. Factor analysis demonstrated a 2-factor structure, explaining 67.58% of total variance. The analysis of responsiveness was calculated with an unpaired t test after 1 week of treatment and demonstrating a statically significant difference between stable and improved patients (P < 0.05). The Spearman correlation coefficient (rS = 0.81; P = 0.000) revealed strong relation between the change in score in the NDI-Ar and global rating of change. No ceiling or floor effects were detected in the NDI-Ar. The Arabic version of the NDI has a 2-factor 10-item structure and is a reliable, valid, and responsive tool that can be used to assess neck pain in Arabic-speaking patients with neck pain. Therefore, it can be recommended for clinical and research purposes.

Validity, reliability and responsiveness of the Japanese version of the Neck Disability Index

BackgroundThe Neck Disability Index (NDI) is one of the most widely used questionnaires for neck pain. The purpose of this study was to validate the Japanese NDI. MethodsWe performed two surveys with an 8-week interval in 130 patients with neck pain, radiculopathy and myelopathy. We asked patients to answer two versions of the Japanese NDI: the original NDI, which had been completed by a forward–backward translation procedure, and the modified NDI, which has the phrase “because of neck pain” to the phase “because of neck pain or numbness in the arm.” The other parameters examined were the strength of pain and numbness, the Japanese Orthopaedic Association Cervical Myelopathy Evaluation Questionnaire, the Hospital Anxiety and Depression Scale, and Short Form 36. Attending surgeons judged the symptom severity. Patients were asked to report the patient global impression of change (PGIC) at the second survey. The internal consistency, criterion-related and discriminative validity, and reliability were evaluated. ResultsThe original NDI and the modified NDI were 26.9±17.1 and 29.9±15.5, respectively. The Cronbach α values of the original NDI and the modified NDI were 0.92 and 0.89, respectively. Both versions of the NDI had good to excellent correlative coefficients with the related domains. The modified NDI had a higher validity for numbness and mental health-related QOL. The symptom severity was significantly correlated with the modified NDI. The intraclass correlation coefficients of the two surveys of the modified and original NDI were comparable. The effect sizes of the modified and the original NDI were 0.64 and 0.55, respectively. Spearman’s ρ between the change of the NDI and the PGIC was 0.47 in the original NDI and 0.59 in the modified NDI. ConclusionsWe demonstrated the validity, reliability and responsiveness of the Japanese NDI. The modified NDI was more strongly correlated with numbness and mental health-related QOL.

The Cultural Adaptation, Reliability and Validity of Neck Disability Index in Patients With Neck Pain

The aim of this study was to conduct the cross-cultural adaptation of Neck Disability Index (NDI) and investigate the validity and reliability of Turkish version in patients with neck pain. The NDI is a reliable evaluation instrument for disability but there are no published Turkish version. Eighty-eight patients with neck pain for at least 3 months were included in the study. NDI, The Neck Pain and Disability Scale and Visual Analogue Scale (VAS) were completed by all subjects. Test-retest reliability was determined by using intraclass correlation coefficient and Pearson's correlation analysis. For the determination of concurrent validity, the relation between NDI and VAS was examined by Pearson's correlation analysis and for the determination of construct validity, the relation between NDI and Neck Pain and Disability Scale was investigated. Intraclass correlation coefficient score for test-retest reliability was 0.979 (95%, confidence interval = 0.968-0.986). For concurrent validity, the relation between NDI and VAS was investigated, the r value for test and retest was 0.508 and 0.620, respectively (P < 0.0001). For construct validity, the relation between NDI and the Turkish version of NPDA was investigated, the r value for test and retest was 0.659 (P < 0.0001) and 0.728 (P < 0.0001), respectively. The Turkish version of NDI was found to be a valid and reliable method of measurement for evaluating disability, caused by problems of the neck region as it is easy to comprehend by the patients and the time needed to apply is short in clinics.