Table 3.
Unadjusted and adjusted percent differences (95% confidence intervals [CI]) in median F2-isoprostane concentration across categories of habitual, past-week, and past-day energy expenditure.
| Exposure measure | No. obs.2 |
Unadjusted % difference (95% CI) |
Adjusted1 % difference (95% CI) |
|---|---|---|---|
| Habitual energy expenditure categorized according to IPAQ cutpoints (16)3 | |||
| Low | 74 | 0.0 (referent) | 0.0 (referent) |
| Moderate | 326 | 1.5 (−11.9, 14.9) | 8.5 (−5.5, 22.4) |
| High | 474 | 10.9 (−2.0, 23.7) | 17.4 (3.3, 31.4) |
| Trend p-value: | 0.02 | 0.003 | |
| Past-week energy expenditure categorized according to IPAQ cutpoints (16)4 | |||
| Low | 280 | 0.0 (referent) | 0.0 (referent) |
| Moderate | 363 | 0.5 (−3.9, 4.9) | 0.3 (−4.1, 4.7) |
| High | 217 | −2.3 (−8.1, 3.4) | −3.3 (−8.0, 3.6) |
| Trend p-value: | 0.48 | 0.50 | |
| Past-day minutes spent in vigorous physical activity5 | |||
| None | 576 | 0.0 (referent) | 0.0 (referent) |
| 1-30 | 121 | −2.3 (−7.1, 2.4) | −2.8 (−7.3, 1.8) |
| 31-180 | 125 | −1.9 (−6.8, 3.1) | −2.9 (−8.1, 2.3) |
| Trend p-value: | 0.36 | 0.18 | |
Adjusted for race (white, black, other), age (<20, 20-29, 30-39, and ≥40 years), parity (0, 1, or ≥2 live births), average hours of sleep (continuous), and percent body fat, menstrual cycle length, and dietary vitamin A intake (quartiles).
Number of observations within each category in the adjusted model. Women could contribute up to 4 observations each (2 observations from 2 cycles).
The unadjusted model was fit on 907 observations from 248 women. The adjusted model was fit on 874 observations from 236 women.
The unadjusted model was fit on 893 observations from 248 women. The adjusted model was fit on 860 observations from 236 women.
The unadjusted model was fit on 851 observations from 247 women. The adjusted model was fit on 822 observations from 236 women.