Table 3.
Adjusted Menstrual Cycle Length Differences in Days Among Women Until the FMP by Percentile
| Percentile Effect |
25th day/s (95%CI) |
50th Median day/s (95%CI) |
75th day/s (95%CI) |
90th day/s (95%CI) |
|---|---|---|---|---|
| Intercept | 24.47 (23.31, 25.62) | 26.09 (25.12, 27.06) | 26.96 (25.97, 27.95) | 27.43 |
| Race/Ethnicity | ||||
| African-American | 0.18 (−1.32, 1.67) | 1.58 (0.18, 2.97) | 2.32 (0.39, 4.24) | 3.21 (−0.72, 7.15) |
| Chinese | 1.14 (0.42, 1.87) | 1.18 (0.49, 1.86) | 1.52 (0.44, 2.60) | 3.32 (0.65, 6.00) |
| Japanese | 1.00 (0.38, 1.62) | 1.02 (0.46, 1.58) | 1.29 (0.29, 2.28) | 2.15 (−0.25, 4.55) |
| White | Referent | Referent | Referent | Referent |
| Body Mass Index, kg/m2 | ||||
| Normal weight (≤24.9) | Referent | Referent | Referent | Referent |
| Overweight (25.0–29.9) | 1.00 (0.40, 1.60) | 0.95 (0.40, 1.50) | 1.14 (−0.01, 2.28) | 1.68 (−0.74, 4.10) |
| Obese (≥ 30) | 1.01 (0.35, 1.66) | 1.13 (0.42, 1.85) | 1.93 (0.85, 3.01) | 3.77 (1.12, 6.43) |
| Current Smoker | 0.02 (−0.94, 0.98) | 0.25 (−0.63, 1.13) | 0.45 (0.77, 1.68) | 0.84 (2.02, 3.70) |
| High School Graduate or Less Education | 0.01 (−0.49, 0.52) | −0.08 (−0.60, 0.45) | −0.25 (1.14, 0.63) | −0.19 (−2.20, 1.81) |
| Every hour of moderate or vigorous physical activity per week | 0.00 (−0.08, 0.08) | 0.05 (−0.04, 0.15) | 0.22 (0.02, 0.42) | 0.97 (0.29, 1.66) |
All associations are adjusted for all factors listed and time until FMP.
Multivariable models contained 18,305 observations from 431 women.
Results are interpreted similar to linear regression.