Table 1. Median and interquartile range of the years elapsed between the urban and rural onsets of advanced fertility decline, cohorts 1896–1982 in 50 African, Asian and Latin American countries.

World Region	Median lag	Variation (interquartile range)	Number of countries
ASIA	5	8	8
MENA	13	7	5
LACarr	16	12	10
SSA	21	14	27

Source: WHS, DHS, MICS, IPUMS.

Note: LACarr = Latin America and the Caribbean, MENA = Middle East and Northern Africa, SSA = sub-Saharan Africa; the onset of advanced fertility decline in each country and type of residence location is defined by the first transition cohort with a fertility level below six children per woman; 10 countries are not considered here due to the left-truncated series of urban fertility (i.e. starting after the tenth cohort year following the national transition onset; see country list in note 1).