Table 3.
Adjusted fecundability ratios for baseline caffeine intake among 662 male pregnancy planners, PRESTO, 2013-16.
| Exposure | No. of Pregnancies | No. of Cycles | Adjusteda FR (95% CI) |
|---|---|---|---|
| Caffeine (mg/day) | |||
| <100 | 147 | 959 | Reference |
| 100-199 | 144 | 808 | 1.09 (0.89, 1.35) |
| 200-299 | 95 | 509 | 1.12 (0.88, 1.42) |
| ≥300 | 61 | 502 | 0.72 (0.54, 0.96) |
| Regular coffee (cups/day)b | |||
| 0 | 120 | 831 | Reference |
| <1 | 106 | 602 | 1.17 (0.91, 1.50) |
| 1 | 126 | 711 | 1.11 (0.88, 1.41) |
| ≥2 | 95 | 634 | 0.88 (0.68, 1.14) |
| Black tea (cups/day)b | |||
| 0 | 352 | 2231 | Reference |
| <1 | 67 | 389 | 0.97 (0.76, 1.23) |
| ≥1 | 28 | 158 | 0.99 (0.70, 1.41) |
| Green tea (cups/day)b | |||
| 0 | 381 | 2340 | Reference |
| <1 | 51 | 370 | 0.81 (0.62, 1.07) |
| ≥1 | 15 | 68 | 1.33 (0.83, 2.13) |
| Caffeinated soda (cans/day)b | |||
| 0 | 179 | 1025 | Reference |
| <1 | 201 | 1173 | 0.97 (0.80, 1.16) |
| 1 | 46 | 382 | 0.77 (0.56, 1.05) |
| ≥2 | 21 | 198 | 0.72 (0.46, 1.11) |
| Energy drinks (servings/day)b | |||
| 0 | 370 | 2237 | Reference |
| <1 | 70 | 441 | 0.99 (0.78, 1.26) |
| ≥1 | 7 | 100 | 0.46 (0.21, 0.98) |
a
Adjusted for age, race, education, BMI, smoking history, intercourse frequency, doing something to improve chances of conception, sleep duration, and average work time.
b
Additionally adjusted for other caffeinated beverages.