Table 1.

Summary of fertility data for seven countries in West Africa. The number of observations for each observed combination of data quality covariates: Source, Period Before Survey (PBS—based on the midpoint of the period before the survey to which the retrospective estimate refers), Direct (specifying whether the observation is a direct or an indirect estimate) and Time span (the number of years included in the observation).

Combination	Source	PBS	Direct	Time span	# Obs.
1	Census	0-1 Year	No	1 Year	18
2			Yes	1 Year	20
3	Survey	0-1 Year	No	1 Year	12
4			Yes	1 Year	12
5		1-5 Years	No	3 Years	1
6	DHS	1-5 Years	No	3 Years	15
7			No	4-5 Years	7
8			Yes	3 Years	13
9			Yes	4-5 Years	23
10			Yes	5+ Years	1
11		5-10 Years	Yes	4-5 Years	23
12			Yes	5+ Years	22
13		10+ Years	Yes	4-5 Years	50