Fig. 4

a Proportions of all lifetime births that are reported in the reference period and b Proportions of all recent births (in the reference period) that are reported in the year immediately following the truncation date Note For surveys that used a fixed truncation date (e.g., January 2011), we calculated the proportion of births reported in 2011 among those reported in the first 5 years of the reference period, to account for the fact that the last calendar year is not complete. We do the same for FBHs. Survey pairs associating two MIS surveys are identified with squares