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. Author manuscript; available in PMC: 2015 Oct 1.
Published in final edited form as: Ann Epidemiol. 2014 Jul 11;24(10):727–733. doi: 10.1016/j.annepidem.2014.07.002

Table 1.

Sample Characteristics.

Variable ALL Asian Black Hispanic White
N % n % n % n % n %
Grandfather's education
 Missing 840 17.3 11 32.4 426 30.6 163 20.0 240 9.2
 Less than High school 1218 25.1 7 20.6 331 23.7 403 49.4 477 18.3
 High School 2021 41.7 8 23.5 521 37.4 197 24.2 1295 49.7
 College or higher 772 15.9 8 23.5 116 8.3 52 6.4 596 22.9
Grandmother's education
 Missing 304 6.3 4 11.8 103 7.4 71 8.7 126 4.8
 Less than High school 1088 22.4 3 8.8 272 19.5 489 60.0 324 12.4
 High School 2860 59.0 20 58.8 896 64.3 235 28.8 1709 65.5
 College or higher 599 12.3 7 20.6 123 8.8 20 2.5 449 17.2
Mother's education at child's birth
 Missing 515 10.6 2 5.9 198 14.2 74 9.1 241 9.2
 Less than High school 228 4.7 0 0.0 38 2.7 111 13.6 79 3.0
 High School 2669 55.0 21 61.8 784 56.2 442 54.2 1422 54.5
 College or higher 1439 29.7 11 32.4 374 26.8 188 23.1 866 33.2
Mother's marital status at child's birth
 Missing 515 10.6 2 5.9 198 14.2 74 9.1 241 9.2
 Not married 1541 31.8 7 20.6 780 56.0 250 30.7 504 19.3
 Married 2795 57.6 25 73.5 416 29.8 491 60.2 1863 71.4
Mother's employment at child's birth
 Missing 2529 52.1 18 52.9 797 57.2 418 51.3 1296 49.7
 Unemployed/part time 920 19.0 5 14.7 272 19.5 172 21.1 471 18.1
 Half/Full time 1402 28.9 11 32.4 325 23.3 225 27.6 841 32.2
Mother's employment when child was 7y
 Missing 1161 23.9 8 23.5 313 22.5 171 21.0 669 25.7
 Unemployed/part time 1780 36.7 10 29.4 492 35.3 326 40.0 952 36.5
 Half/Full time 1910 39.4 16 47.1 589 42.3 318 39.0 987 37.8
Family income quartile at child's birth
 Missing 515 10.6 2 5.9 198 14.2 74 9.1 241 9.2
 1 1084 22.3 5 14.7 499 35.8 192 23.6 388 14.9
 2 1084 22.3 6 17.6 390 28.0 246 30.2 442 16.9
 3 1084 22.3 10 29.4 199 14.3 191 23.4 684 26.2
 4 1084 22.3 11 32.4 108 7.7 112 13.7 853 32.7
Family wealth quartile at child's birth
 Missing 1023 21.1 3 8.8 352 25.3 168 20.6 500 19.2
 1 956 19.7 5 14.7 487 34.9 194 23.8 270 10.4
 2 958 19.7 4 11.8 307 22.0 204 25.0 443 17.0
 3 957 19.7 12 35.3 180 12.9 149 18.3 616 23.6
 4 957 19.7 10 29.4 68 4.9 100 12.3 779 29.9
Family size at child's birth
 Missing 515 10.6 2 5.9 198 14.2 74 9.1 241 9.2
 5+ 996 20.5 6 17.6 421 30.2 229 28.1 340 13.0
 1-4 3340 68.9 26 76.5 775 55.6 512 62.8 2027 77.7
Mother had prenatal visits during pregnancy
 Missing 384 7.9 3 8.8 114 8.2 93 11.4 174 6.7
 No 62 1.3 0 0.0 22 1.6 17 2.1 23 0.9
 Yes 4405 90.8 31 91.2 1258 90.2 705 86.5 2411 92.4
Mother's marital status at child's birth and 7y
 Missing, Missing 389 8.0 1 2.9 149 10.7 57 7.0 182 7.0
 Missing, Not married 62 1.3 0 0.0 31 2.2 9 1.1 22 0.8
 Not married, Missing 367 7.6 2 5.9 154 11.0 60 7.4 151 5.8
 Not married, Not married 785 16.2 1 2.9 477 34.2 118 14.5 189 7.2
 Missing, Married 64 1.3 1 2.9 18 1.3 8 1.0 37 1.4
 Not married, Married 389 8.0 4 11.8 149 10.7 72 8.8 164 6.3
 Married, Missing 662 13.6 6 17.6 84 6.0 115 14.1 457 17.5
 Married, Not married 394 8.1 4 11.8 106 7.6 71 8.7 213 8.2
 Married, Married 1739 35.8 15 44.1 226 16.2 305 37.4 1193 45.7
Child's BMI at 8-9 years
 Missing 961 19.8 6 17.6 220 15.8 156 19.1 579 22.2
 <5 369 7.6 3 8.8 121 8.7 58 7.1 187 7.2
 5 – 85 2350 48.4 19 55.9 635 45.6 387 47.5 1309 50.2
 >85 1171 24.1 6 17.6 418 30.0 214 26.3 533 20.4
Mother's age at menarche
 Missing 88 1.8 3 8.8 11 0.8 22 2.7 52 2.0
 5 - 8 8 0.2 0 0.0 2 0.1 1 0.1 5 0.2
 9 – 12 2162 44.6 13 38.2 635 45.6 403 49.4 1111 42.6
 13 – 16 2531 52.2 18 52.9 722 51.8 380 46.6 1411 54.1
 >16 62 1.3 0 0.0 24 1.7 9 1.1 29 1.1

Note: all p-values were significant at the p<0.001 for chi-square tests of association.