Table 1.
Patterns of caffeine use pre- and post-pregnancy awareness (n = 1232).
| Outcome | Trimester 1 (Pre-Pregnancy Awareness) | Trimester 1 (Post-Pregnancy Awareness) | Trimester 2 | Trimester 3 |
|---|---|---|---|---|
| Used any caffeine % (n) | 89 (1091) | 68 (834) | 79 (976) | 80 (980) |
| Of those who used caffeine: | ||||
| Median typical caffeine intake per consumption day (IQR) | 107 (60–147) | 60 (40–107) | 80 (40–107) | 80 (40–107) |
| 3+ days a week % (n) | 88 (962) | 74 (616) | 74 (723) | 82 (802) |
| Median maximal caffeine intake per consumption day (IQR) | 187 (120–242) | 120 (80–187) | 120 (83.5–187) | 132 (80–200) |
| 3+ days a week % (n) | 27 (139) | 25 (59) | 22 (72) | 23 (85) |
| Typical or maximal caffeine intake exceeds guideline % (n) | 30 (325) | 10 (82) | 4 (35) | 5 (50) |
| Typical intake exceeds guideline (>200 mg in a day) % (n) | 16 (170) | 4 (36) | 8 (78) | 9 (92) |
| Maximal intake exceeds guideline (>200 mg in a day) % (n) | 22 (236) | 7 (54) | 11 (102) | 13 (125) |
Note: Pre-pregnancy awareness was defined as conception to the participants’ point of pregnancy awareness, and post-pregnancy awareness was defined as the point of pregnancy awareness until end of T1. IQR: inter-quartile range.