Caffeine source | All PTD (22+0 to 36+6 weeks) | Early PTD (22+0 to 33+6 weeks) | Late PTD (34+0 to 36+6 weeks) | ||||||
---|---|---|---|---|---|---|---|---|---|
 | ORa | 95% CI | Pvalueb | ORa | 95% CI | Pvalueb | ORa | 95% CI | Pvalueb |
Total | 0.98 | 0.92 to 1.05 | 0.6 | 0.96 | 0.81 to 1.14 | 0.7 | 0.99 | 0.92 to 1.06 | 0.7 |
Coffee, all types | 0.96 | 0.89 to 1.04 | 0.3 | 0.82 | 0.66 to 1.02 | 0.08 | 0.98 | 0.91 to 1.07 | 0.7 |
Caffeinated soft drinksc | 1.10 | 0.90 to 1.34 | 0.4 | 1.21 | 0.77 to 1.89 | 0.4 | 1.07 | 0.87 to 1.33 | 0.5 |
Black tea | 0.99 | 0.82 to 1.20 | 0.9 | 1.61 | 1.10 to 2.35 | 0.01 | 0.89 | 0.71 to 1.11 | 0.3 |
Chocolate | 1.43 | 0.55 to 3.67 | 0.5 | 1.08 | 0.10 to 12.06 | 0.9 | 1.51 | 0.55 to 4.15 | 0.4 |