Table 1.
Sample characteristics of women (N = 292) aged 55–89 years by tertile of birth weight; Rancho Bernardo, CA, 1988–1991
| All | Lowest tertileb | Middle tertileb | Highest tertileb | F or χ2 | P-value | |
|---|---|---|---|---|---|---|
| 2.0–6.9 lbs | 7.0–8.0 lbs | 8.1–12.4 lbs | ||||
| (n = 90) | (n = 113) | (n = 89) | ||||
| Continuous Variable mean (SD) | ||||||
| Age (years) | 71.1 (8.6) | 71.1 (8.2) | 71.4 (8.8) | 70.9 (8.9) | 0.07 | 0.93 |
| Categorical Variables (%) | ||||||
| Some collegea | 71.8 | 71.9 | 74.3 | 68.5 | 0.83 | 0.66 |
| Smoking | 1.30 | 0.03 | ||||
| Never | 49.0 | 19.2 | 17.5 | 12.3 | ||
| Past | 40.4 | 8.6 | 17.1 | 14.7 | ||
| Current | 10.6 | 3.1 | 4.1 | 3.4 | ||
| Alcohol intake (≥3 times/week) | 41.1 | 41.1 | 41.6 | 40.4 | 0.03 | 0.99 |
| Ever use estrogen | 77.9 | 71.9 | 80.4 | 80.9 | 2.72 | 0.26 |
All variables had <5% missing
aCollege defined as > High school versus ≤ High school
bMeans and medians of birth weights within each tertile were: Tertile 1: mean = 5.3 lbs, median = 5.2 lbs; Tertile 2:mean = 7.6 lbs, median = 7.5; and Tertile 3: mean = 9.5 lbs, median = 9.0 lbs