Validity of parental work information on the birth certificate

BMC Public Health

Table 5 Birth Certificate Compared with Interview for Maternal Industrial Sectors of Work During First Trimester

		Women employed outside home according to both sources^a
North American Industry Classification System (NAICS) industrial sector	Number (%) misclassified as homemaker or student on vital record	Number by interview	Number by birth certificate^b	Number by both sources	Sensitivity (%) (95% CI)	Specificity (%) (95% CI)	Kappa
Manufacturing	4 (22.2)	14	15	12	85.7 (60.3 – 97.5)	98.6 (96.2 – 99.6)	0.82
Wholesale & retail trade	25 (36.8)	42	40	35	83.3 (69.8 – 92.4)	97.3 (94.1 – 99.0)	0.82
Finance & insurance	4 (18.2)	17	17	16	94.1 (74.3 – 99.7)	99.5 (97.7 – 99.9)	0.94
Professional, scientific, & technical services	4 (28.6)	10	9	7	70.0 (38.0 – 91.7)	99.1 (97.0 – 99.9)	0.73
Administration & support; waste management	8 (38.1)	12	11	7	58.3 (30.2 – 82.8)	98.1 (95.6 – 99.4)	0.59
Educational services	8 (21.1)	29	27	24	82.8 (65.8 – 93.4)	98.5 (95.9 – 99.6)	0.84
Health care & social assistance	10 (15.4)	52	53	48	92.3 (82.5 – 97.5)	97.2 (93.8 – 98.9)	0.89
Accommodation & food services	31 (67.4)	15	16	13	86.7 (62.5 – 97.7)	98.6 (96.2 – 99.6)	0.83
Public administration	5 (20.8)	19	14	13	68.4 (45.5 – 86.1)	99.5 (97.7 – 99.9)	0.77

^aMothers who were listed as homemaker, student or unemployed are excluded in these analyses. Only industrial groups with 10 or more workers are shown in Table.
^bOne missing each for manufacturing, finance and insurance, administrative support, and educational services sectors. Three missing for health care and social assistance sectors.

ISSN: 1471-2458