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Table 3 Birth Certificate Compared with Interview for Maternal Occupation During First Trimester

From: Validity of parental work information on the birth certificate

   Women employed outside home according to both sourcesa
Standard Occupational Classification (SOC) group Number (%) misclassified as homemaker or student on vital record Number by interview Number by birth certificateb Number by both sources Sensitivity (%) (95% CI) Specificity (%) (95% CI) Kappa
Management 2 (10.5) 17 19 14 82.4 (59.1 – 95.3) 97.7 (94.9 – 99.1) 0.76
Education, training, & library 4 (15.4) 22 22 19 86.4 (67.2 – 96.4) 98.6 (96.2 – 99.6) 0.85
Health diagnosing & treating practitioners 0 (0.0) 14 17 14 100 (80.7 – 100) 98.6 (96.3 – 99.7) 0.90
Health technologists & technicians 2 (16.7) 10 7 7 70.0 (38.0 – 91.7) 100 (98.7 – 100) 0.82
Health care support 4 (23.5) 12 12 10 83.3 (54.9 – 97.1) 99.1 (97.0 – 99.9) 0.82
Food preparation & serving 26 (65.0) 14 11 10 71.4 (44.6 – 90.2) 99.5 (97.8 – 99.9) 0.79
Sales & related occupations 30 (44.1) 37 37 32 86.5 (72.6 – 94.9) 97.4 (94.4 – 99.1) 0.84
Office & administrative support 21 (24.7) 63 56 49 77.8 (66.3 – 86.8) 95.9 (92.0 – 98.2) 0.76
Production occupations 6 (30.0) 14 13 12 85.7 (60.3 – 97.5) 99.5 (97.8 – 99.9) 0.88
  1. aMothers who were listed as homemaker, student or unemployed are excluded in these analyses. Only occupations with 10 or more workers by interview are shown in Table.
  2. bOne missing occupation each for health care support, sales, and office support occupations.