Cost-effectiveness analysis of a large-scale crèche intervention to prevent child drowning in rural Bangladesh

Table 3 Societal cost

Parameters (in 2015 US$)	Annual volunteer-hours per crèche	Annual cost per crèche	Annual cost per child
Opportunity cost of time*
Crèche workers' time (mother and assistant)^†	2304.00	$941.76	$36.25
VIPC and UIPC members' time	138.72	$56.70	$2.18
Parents' time^‡	3392.26	− $5546.35	− $213.48
Program cost
Estimates from Table 2	–	$416.35	$16.03
Total cost (savings)
Opportunity cost of time + program cost		− $4131.54	− $159.02

Negative values indicate savings. VIPC and UIPC are Village and Union Injury Prevention Committees. See the Additional file 1 for details about data assumptions and calculations. Assumptions are varied in sensitivity analysis
*The opportunity cost of time is the minimum wage, 8000 BDT per month in the year 2018 based on Butler (2019), equivalent to US$78.48 in 2015
^†A crèche operates for 4 h per day, 6 days per week, which is part-time, thus the wage per crèche worker is 50% of the minimum wage
^‡Assumes savings for only one parent per child and the estimate is a function of the minimum wage and crèche attendance level, see the Additional file 1 for details. Parameters with black bold text indicate major parameter groups: opportunity cost, program cost, total societal cost

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