Table 2.
Unstratified comparisons of birth record variables and the Pregnancy, Infection, and Nutrition (PIN) cohort study variables, 2001–05
| Birth records | PIN | Correlations | |||
|---|---|---|---|---|---|
|
| |||||
| Maternal demographics and health behaviours – categorical | |||||
| Prevalence n (%) | n | % Agreement | Kappa [95% CI] | ||
| Maternal race | 1683 | 96.61% | 0.93 [0.89, 0.96] | ||
| White NH | 1186 (70.5) | 1179 (76.6) | |||
| Black NH | 366 (21.8) | 356 (23.1) | |||
| Other | 131 (7.8) | 5 (0.3) | |||
| Maternal marital status | 1681 | 95.60% | 0.88 [0.86, 0.91] | ||
| Married | 1291 (76.6) | 1226 (72.9) | |||
| Not married | 394 (23.4) | 455 (27.1) | |||
| Maternal alcohol consumption | 1457 | 99.59% | 0.25 [0.00, 0.67] | ||
| Drink <5/week | 1684 (99.9) | 1450 (99.5) | |||
| Drink ≥5/week: | 1 (0.1) | 7 (0.5) | |||
|
| |||||
| Maternal demographics, health behaviours and previous pregnancies – continuous | |||||
| Mean (SD) | n | Spearman [95% CI] | CCC [95% CI] | ||
|
| |||||
| Years of education | 15.0 (3.1) | 15.5 (3.0) | 1677 | 0.94 [0.93, 0.95] | 0.86 [0.85, 0.87] |
| Maternal age | 29.7 (5.7) | 29.0 (5.7) | 1685 | 0.995 [0.99, 1.00] | 0.99 [0.99, 0.99] |
| Maternal weight gain | 32.9 (12.7) | 33.7 (13.1) | 1557 | 0.82 [0.79, 0.84] | 0.82 [0.80, 0.83] |
| Number of cigarettes smoked | 1.0 (3.6) | 0.7 (2.8) | 1453 | 0.81 [0.75, 0.86] | 0.80 [0.78, 0.82] |
| Number of previous pregnancies | 0.8 (1.0) | 0.8 (1.0) | 1635 | 0.97 [0.96, 0.98] | 0.96 [0.96, 0.97] |
|
| |||||
| Major pregnancy events – categorical | |||||
| Prevalence n (%) | n | % Agreement | Kappa [95% CI] | ||
|
| |||||
| Birthweight (g) | 1685 | 98.99% | 0.94 [0.91, 0.97] | ||
| <1500 | 30 (1.8) | 32 (1.9) | |||
| 1500–2499 | 125 (7.4) | 115 (6.8) | |||
| ≥2500 | 1530 (90.8) | 1538 (91.3) | |||
| Gestation | 1685 | 97.98% | 0.91 [0.88, 0.94] | ||
| Preterm | 217 (12.9) | 219 (13.0) | |||
| Full-term | 1468 (87.1) | 1466 (87.0) | |||
| Anaemia | 1640 | 70.73% | 0.18 [0.14, 0.23] | ||
| Anaemic any time during pregnancy | 150 (8.9) | 538 (32.8) | |||
| Not anaemic any time during pregnancy | 1535 (91.1) | 1102 (67.2) | |||
| Gestational diabetes (GDM) | 1643 | 93.79% | 0.09 [0.01, 0.17] | ||
| Diabetes | 54 (3.2) | 64 (3.9) | |||
| No diabetes | 1631(96.8) | 1579 (96.1) | |||
| Pregnancy-induced hypertension (PIH)/eclampsia | 1600 | 94.56% | 0.70 [0.63, 0.75] | ||
| PIH/eclampsia | 147 (9.0) | 173 (10.5) | |||
| No PIH/eclampsia | 1493 (91.0) | 1470 (89.5) | |||
|
| |||||
| Major pregnancy events – continuous | |||||
| Mean (SD) | n | Spearman [95% CI] | CCC [95% CI] | ||
|
| |||||
| Gestation | 38.4 (2.4) | 38.4 (2.4) | 1685 | 0.90 [0.89, 0.92] | 0.96 [0.96, 0.96] |
| Birthweight | 3276.5 (627.0) | 3284.8 (626.6) | 1679 | 0.99 [0.98, 0.99] | 0.99 [0.99, 0.99] |
CCC, concordance correlation coefficients; CI, confidence interval; NH, non-Hispanic.