Table 2 Definitions of reliable and unreliable reporting
CategoryNumber of age-at-event reportsImputed response
123+
ConsistentReport ⩽ age at surveyBoth reports same AND both reports ⩽ age at surveyAll reports same AND all reports ⩽ age at surveyReported ageReliable
Inconsistent: can be correctedN/AReports differ by 1 year AND both reports ⩽ age at survey2 ages reported which differ by 1 year AND both reports ⩽ age at surveyOlder of the 2 agesReliable
Inconsistent: can be estimatedN/A1 report ⩽ age at survey⩾50% of reports same AND these reports ⩽ age at surveyMost frequent report that is ⩽ age at surveyReliable
Unreliable: cannot be estimated or correctedReport >age at surveyReports 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 surveyMean of all reported agesUnreliable