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Table 1 Agreement between NBDPS Interview and Birth Certificate for Parental Occupation and Industry by Case-control Status

From: Validity of parental work information on the birth certificate

	Mother^a						Father^b
	Cases			Controls			Cases			Controls
	N	% Missing included	% Missing excluded	N	% Missing included	% Missing excluded	N	% Missing included	% Missing excluded	N	% Missing included	% Missing excluded
Occupation
Agreement	226	74.6	76.9	263	78.7	79.7	184	64.1	76.0	198	62.7	74.4
Disagreement	68	22.4	23.1	67	20.1	20.3	58	20.2	24.0	68	21.5	25.6
Unknown^c	9	3.0	-	4	1.2	-	45	15.7	-	50	15.8	-
Total	303	100.0	100.0	334	100.0	100.0	287	100.0	100.0	316	100.0	100.0
Industry
Agreement	216	71.3	74.5	256	76.6	77.8	179	63.0	76.2	187	59.2	73.3
Disagreement	74	24.4	25.5	73	21.9	22.2	56	19.7	23.8	68	21.5	26.7
Unknown^c	13	4.3	-	5	1.5	-	49	17.3	-	61	19.3	-
Total	303	100.0	100.0	334	100.0	100.0	284	100.0	100.0	316	100.0	100.0

^aIn the interview, 4 case mothers and 8 control mothers were missing information about occupation and industry.
^bIn the interview, 20 case fathers and 26 control fathers were missing information about occupation and 23 case fathers and 26 control fathers were missing information about industry.
^cUnknown category includes subjects with missing information on the birth certificate.

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ISSN: 1471-2458

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