Outcomes | Group 1 n = 690,093 | Group 2 n = 2,792,977 | Group 3 n = 1,736,063 | P-values a |
---|---|---|---|---|
PTB, n (%) | 39,986 (5.79) | 147,697 (5.29) | 85,860 (4.95) | |
 OR (95%CI) | 1.00 | 0.908 (0.898, 0.918) | 0.846 (0.836, 0.856) | < 0.001 A, B, C |
 OR adj (95%CI) | 1.00 | 0.944 (0.933, 0.955) | 0.869 (0.858, 0.879) | < 0.001 A, B, C |
< 28w, n (%) | 523 (0.08) | 1542 (0.06) | 975 (0.06) | |
 OR (95%CI) | 1.00 | 0.725 (0.656, 0.800) | 0.734 (0.660, 0.817) | < 0.001 A, B, C |
 OR adj (95%CI) | 1.00 | 0.755 (0.684, 0.834) | 0.793 (0.713, 0.882) | 0.006 A, B, C |
28 ∽ 31w, n (%) | 3264 (0.47) | 11,248 (0.40) | 7837 (0.45) | |
 OR (95%CI) | 1.00 | 0.847 (0.814, 0.881) | 0.946 (0.908, 0.985) | < 0.001 A, B, C |
 OR adj (95%CI) | 1.00 | 0.889 (0.855, 0.924) | 0.982 (0.942, 1.023) | < 0.001 A, B, C |
32 ∽ 36w, n (%) | 36,199 (5.24) | 134,907 (4.83) | 77,048 (4.44) | |
 OR (95%CI) | 1.00 | 0.916 (0.905, 0.927) | 0.839 (0.828, 0.849) | < 0.001 A, B, C |
 OR adj (95%CI) | 1.00 | 0.952 (0.940, 0.963) | 0.860 (0.849, 0.871) | < 0.001 A, B, C |
LBW, n% | 34,384 (4.98) | 137,262 (4.91) | 69,473 (4.00) | |
 OR (95%CI) | 1.00 | 0.986 (0.974, 0.998) | 0.795 (0.785, 0.806) | < 0.001 A, B, C |
 OR adj (95%CI) | 1.00 | 1.001 (0.989, 1.014) | 0.792 (0.781, 0.802) | < 0.001 A, B, C |
500 ∽ 999 g, n% | 641 (0.09) | 1584 (0.05) | 1044 (0.06) | |
 OR (95%CI) | 1.00 | 0.610 (0.557, 0.669) | 0.641 (0.581, 0.707) | < 0.001 A, B, C |
 OR adj (95%CI) | 1.00 | 0.665 (0.607, 0.729) | 0.698 (0.632, 0.770) | < 0.001 A, B, C |
1000 ∽ 1499 g, n% | 2336 (0.34) | 8560 (0.31) | 5311 (0.31) | |
 OR (95%CI) | 1.00 | 0.905 (0.864, 0.947) | 0.895 (0.852, 0.939) | < 0.001 A, B, C |
 OR adj (95%CI) | 1.00 | 0.964 (0.921, 1.009) | 0.930 (0.885, 0.976) | < 0.001 A, B, C |
1500 ∽ 2499 g, n% | 31,407 (4.55) | 127,118 (4.55) | 63,118 (3.63) | |
 OR (95%CI) | 1.00 | 0.999 (0.987, 1.012) | 0.791 (0.780, 0.802) | < 0.001 A, B, C |
 OR adj (95%CI) | 1.00 | 1.011 (0.998, 1.023) | 0.784 (0.773, 0.795) | < 0.001 A, B, C |