Kernel density estimation of usual hours worked per week, treatment and control groups. Source: Data are from South African Labour Force Surveys (LFS) conducted by Statistics South Africa (September 2000 to September 2007). Notes: Figures include both full-time and part-time workers. Usual hours worked per week are self-reported by workers and estimates shown are for the weighted sample. Sample includes non self-employed workers aged between 15 and 65 years inclusive. The sample includes non-government employment only. The vertical line is drawn at 45 hours per week. Using the Kolmogorov-Smirnov test, the null hypothesis of the equality of distributions at the 1 or 5 percent level is rejected for each pair-wise comparison of the before and after periods for the Retail, Domestic, Forestry and Security sectors only. The null hypothesis of the equality of distributions is also rejected for the control groups at the 1 percent level.