The cutoff dates for asking the health questions about recent births in the two Kenya surveys were January 1998 (2003 survey) and January 2003 (2008/09 survey). Birth transference occurred in both surveys, resulting in more deceased children recorded as born in the year prior to the health cutoff than in the year after the cutoff (Table 5). The index of birth transference was 1.34 (1158/862) in 2003 and 1.32 (1228/932) in 2008/09.