Table 3.
Characteristics of phase 1 and unweighted phase 2 samples, and discrepancies.
| Variable | Phase 1 N = 10, 335 |
Phase 2a n = 996 |
Percent Errorb | Discrepancy |
|---|---|---|---|---|
| Child obesity | 17.9% | 42.0% | 0.6 | PPV=0.998, NPV=0.991 |
| Time to event/censoring (age, yrs) | 4.3 (2.9, 6.0)c | 4.8 (3.0, 6.0) | 4.7 | 1.0 (range 0.04, 1.8) |
| Maternal weight gain (kg/wk) | 0.30 (0.26, 0.38) | 0.30 (0.22, 0.41) | 100 | −0.02 (range −0.66, 0.93) |
| Maternal BMI (kg/m2) | 25.9 (22.6, 30.5) | 27.9 (23.8, 33.1) | 100 | 0.13 (range −6.8, 8.6) |
| Maternal age (yrs) | 28.0 (23.5, 32.3) | 27.4 (23.0, 31.8) | 0 | – |
| Maternal race | 5.4 | |||
| White | 61.8% | 56.8 | PPV=0.952, NPV=0.962 | |
| Black | 23.1% | 29.7 | PPV=0.986, NPV=0.993 | |
| Asian | 6.9% | 4.0 | PPV=0.904, NPV=0.998 | |
| Other/Unknown | 8.2% | 9.4 | PPV=0.778, NPV=0.966 | |
| Maternal ethnicity, Hispanic | 14.9% | 14.9% | 1.1 | PPV=0.948, NPV=0.996 |
| Maternal diabetes | 10.9 | |||
| None | 83.3% | 89.4 | PPV=0.991, NPV=0.553 | |
| Gestational | 13.7% | 6.7 | PPV=0.420, NPV=0.992 | |
| Type 1 or 2 | 3.0% | 3.9 | PPV=0.472, NPV=0.977 | |
| Cesarean delivery | 36.2% | 38.2% | 1.3 | PPV=0.989, NPV=0.986 |
| Child sex, male | 52.7% | 55.4% | 0.4 | PPV=0.995, NPV=0.998 |
| Maternal depression | 8.9% | 10.9% | 13.5 | PPV=0.376, NPV=0.926 |
| No private insurance | 45.9% | 67.6% | 24.3 | PPV=0.941, NPV=0.580 |
| Singleton | 98.1% | 97.3% | 1.2 | PPV=0.992, NPV=0.826 |
| Maternal smoking | 6.3% | 13.2% | 11.8 | PPV=0.618, NPV=0.897 |
| Marriedd | – | 51.8% | – | – |
| Number prior live birthsd | – | 0.5 (0, 1) | – | – |
| Gestational aged (wks) | – | 39.1 (38.1, 40.3) | – | – |
| Child asthmae | 10.4% | 13.0% | 10.4 | PPV=0.570, NPV=0.973 |
| Maternal asthmae | 7.8% | 11.0% | 4.5 | PPV=0.827, NPV=0.968 |
a
Not meant to represent the study populations. Children diagnosed with obesity and asthma were intentionally over-sampled in phase 2 .
b
Percentage of phase 2 values that did not match phase 1 value.
c
Median (25th percentile, 75 th percentile) are reported for continuous variables unless range is noted.
d
Marital status, number of prior live births, and estimated gestational age were not available in the phase 1 data. Gestational age was assumed to be 39 weeks for computing maternal weight gain per week.
e
Child asthma and maternal asthma are only shown for the in phase 1 and in phase 2 meeting the inclusion criteria for the asthma sub-study.