Table 2. Definitions of reliable and unreliable reporting.

Category	Number of age-at-event reports			Imputed response
	1	2	3+
Consistent	Report ⩽ age at survey	Both reports same AND both reports ⩽ age at survey	All reports same AND all reports ⩽ age at survey	Reported age	Reliable
Inconsistent: can be corrected	N/A	Reports differ by 1 year AND both reports ⩽ age at survey	2 ages reported which differ by 1 year AND both reports ⩽ age at survey	Older of the 2 ages	Reliable
Inconsistent: can be estimated	N/A	1 report ⩽ age at survey	⩾50% of reports same AND these reports ⩽ age at survey	Most frequent report that is ⩽ age at survey	Reliable
Unreliable: cannot be estimated or corrected	Report >age at survey	Reports differ by >1 year AND both reports ⩽ age at survey OR both reports > age at survey	<50% of reports same OR ⩾50% reports same AND reports > age at survey	Mean of all reported ages	Unreliable