TABLE 1.
Maternal characteristics by daily caffeine consumption from caffeinated beverages around week 17 of pregnancy1
| Caffeine consumption, mg |
||||||
| None | 1–100 | 101–200 | 201–300 | >300 | Total | |
| n | 27,684 (27) | 48,487 (48) | 16,686 (17) | 5334 (5) | 2969 (3) | 101,160 (100) |
| Age, y | ||||||
| <25 | 4070 (36) | 5373 (48) | 1166 (10) | 384 (3) | 241 (2) | 11,234 (100) |
| 25–29 | 10,319 (31) | 16,456 (49) | 4576 (14) | 1128 (4) | 676 (2) | 33,255 (100) |
| 30–34 | 9672 (25) | 18,913 (48) | 7091 (18) | 2190 (6) | 1146 (3) | 39,012 (100) |
| ≥35 | 3623 (21) | 7745 (44) | 3853 (22) | 1532 (9) | 906 (5) | 17,659 (100) |
| Education, y | ||||||
| <12 | 2192 (28) | 3206 (42) | 1173 (15) | 599 (8) | 549 (7) | 7719 (100) |
| 12 | 7818 (29) | 12,183 (46) | 4164 (16) | 1545 (6) | 1045 (4) | 26,755 (100) |
| 13–16 | 10,777 (28) | 19,249 (49) | 6267 (16) | 1930 (5) | 886 (2) | 39,109 (100) |
| ≥17 | 5252 (23) | 11,455 (51) | 4286 (19) | 1021 (5) | 367 (2) | 22,381 (100) |
| Missing | 1645 (32) | 2394 (46) | 796 (15) | 239 (5) | 122 (2) | 5196 (100) |
| Medically assisted reproduction | ||||||
| No | 28,835 (27) | 47,161 (48) | 16,244 (17) | 5225 (5) | 2916 (3) | 98,381 (100) |
| Yes | 849 (31) | 1326 (48) | 442 (16) | 109 (4) | 53 (2) | 2779 (100) |
| Smoking | ||||||
| No | 22,747 (29) | 39,081 (50) | 11,681 (15) | 2975 (4) | 1088 (1) | 77,572 (100) |
| Quit in pregnancy | 3186 (22) | 6480 (45) | 3122 (22) | 1075 (7) | 551 (4) | 14,414 (100) |
| 1–9 cigarettes/d | 976 (15) | 2307 (36) | 1454 (22) | 959 (15) | 771 (12) | 6467 (100) |
| ≥10 cigarettes/d | 233 (12) | 484 (25) | 371 (19) | 291 (15) | 530 (28) | 1909 (100) |
| Missing | 542 (68) | 135 (17) | 58 (7) | 34 (4) | 29 (4) | 798 (100) |
1
Values are n (%).