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Table 2 Agreement between NBDPS Study Interview and Birth Certificate for Parental Occupation by Maternal Characteristics

From: Validity of parental work information on the birth certificate

  Maternal Occupation Paternal Occupation
   Agreementa   Agreementa
Maternal characteristic N (%) missing N % Missing included % Missing excluded N (%) missing N % Missing included % Missing excluded
Age at delivery (in years)
   < 18 4 (6.1) 51 77.3 82.3b 33 (50.0) 22 33.3 66.7c
   18 – 19 4 (5.6) 46 64.8 68.7 27 (38.0) 26 36.6 59.1
   20 – 24 10 (5.8) 118 68.6 72.8 40 (23.3) 94 54.7 71.2
   25 – 29 3 (1.8) 128 78.5 80.0 23 (14.1) 110 67.5 78.6
   30 – 34 2 (1.7) 104 87.4 88.9 14 (11.8) 88 73.9 83.8
   35 – 39 1 (2.3) 30 69.8 71.4 2 (4.7) 31 72.1 75.6
   40 or older 1 (6.7) 12 80.0 85.7 2 (13.3) 11 73.3 84.6
Education (in years)
   0 – 8 2 (3.8) 42 80.8 84.0 17 (32.7) 22 42.3 62.9d
   9 – 11 4 (3.0) 98 74.2 76.6 47 (35.6) 54 40.9 63.5
   12 9 (4.1) 153 70.2 73.2 45 (20.6) 134 61.5 77.5
   13 – 15 3 (1.9) 126 79.2 80.8 22 (13.8) 107 67.3 78.1
   16 or more 1 (1.2) 70 86.4 87.5 4 (4.9) 64 79.0 83.1
Race/ethnicity
   Non-Hispanic White 3 (1.4) 166 76.1 77.2c 30 (13.8) 151 69.3 80.3
   Non-Hispanic Black 2 (9.1) 11 50.0 55.0 8 (36.4) 9 40.9 64.3
   Hispanic 13 (3.5) 282 76.4 79.2 90 (24.4) 202 54.7 72.4
   Other 1 (3.2) 29 93.5 96.7 5 (16.1) 19 61.3 79.2
Periconceptional folic acid usee
   Yes 5 (2.2) 175 77.1 78.8 25 (11.0) 163 71.8 80.7
   No 15 (3.6) 314 75.3 78.1 111 (26.6) 219 52.5 71.6d
  1. a N represents the number in each category that agreed. Missing cases are not included in chi-square statistics.
  2. b p = 0.05, Fisher's exact probability.
  3. c p < 0.05, Fisher's exact probability.
  4. d p < 0.05.
  5. e Periconceptional folic acid use included any use during the period one month prior through one month post concepton.