Figure 4.

Relative cost estimates based on different methods of time valuation for lost wages. Relative cost represents the relative change in absolute disease cost for each quintile of increasing poverty in either SAMPI deprivation score or income. The y-axis is on a log scale. Error bars represent 95% confidence intervals. “Income adjusted” denotes valuation of time as median hourly wage of the patient’s income quintile (primary analysis). “Equal income” denotes equal valuation of time for all patients using the study median as the hourly wage. “Patient estimates” denotes valuation of time based directly on patient estimates rather than an hourly wage. “No time value” refers to ignoring lost wages due to time loss and considering only out-of-pocket costs and changes to income as a result of illness. SAMPI = South African Multidimensional Poverty Index