A study comparing the WHO C-Model caesarean section rates and observed caesarean section rates at Port Moresby General Hospital, Papua New Guinea.

Abstract

Worldwide, there is an increase in caesarean deliveries. Ideal caesarean section (CS) rates continue to be a matter for debate. The World Health Organization (WHO) C-Model, is a mathematical modelling tool to assist health facilities estimate expected CS rates based on the quality middle income facilities practice. To compare WHO C-Model derived CS rates with actual CS rates at Port Moresby General Hospital. Clinical and obstetric data for women who delivered during a fourmonths period was used to calculate CS probability using the WHO C-Model online calculator. Comparisons of CS rates were made for the entire cohort, as well as for each Robson Classification group to assess whether there was either 'under' or 'overusage' of CS according to the C-Model estimates. The actual CS rate of 5.5% (246/4437) was lower than the mean C-Model rate of 8%. The C-Model rate equates to an almost 45% increase in CS rates or an additional 111 caesarean deliveries be done during the fourmonths study period. The WHO C-Model had good predictability among most of the low-risk Robson groups that accounted for just over 80% of the study population. The suggested additional 111 caesarean deliveries needed to be performed among high-risk Robson groups represented 15% of the study population. Local hospital protocols pertaining to management of both low- and high-risk cases are credited for keeping CS rates to a minimum. A lower threshold for CS in Robson groups two and four could have led to better perinatal outcomes.