STATISTICAL ANALYSIS
All statistical analyses were performed using SPSS version. Assuming
that labour data was log normally distributed, distribution of times for
progression from one integer centimetre of dilatation to the next was
calculated from the median value. Women were plotted on modified WHO
partograph, when they are 4 cm dilated so in both groups, the labour
curve starts from 4 cm. An interval-censored regression was used and the
regression was carried out in reverse, using 10 cm as the starting point
and going backward. For normally distributed data, differences between
groups were assessed using Student’s t-test. (P < 0.05 for all
comparisons) .