Medication use during pregnancy, gestational age and date of delivery: agreement between maternal self-reports and health database information in a cohort

Table 5 Agreement between self-reported questionnaire and birth certificate database information

	Gestational age (weeks)		Date of delivery^a (day)		Prenatal visits (number)		Prenatal ultrasound examinations (number)
	N	%	N	%	N	%	N	%
Exact match	634	85.2	759	99.5	186	24.2	254	33.1
±1	100	13.4	4	0.5	234	30.5	185	24.1
±2	9	1.2	-	-	106	13.8	89	11.6
±3+	1	0.1			241	31.4	239	31.2

ISSN: 1471-2393