Cohort characteristics
| Non-immigrants | India | China | Pakistan | Philippines | Vietnam | Bangladesh | Somalia | Nigeria | |
| Sample size | 230 034 | 10 038 | 7 468 | 5 824 | 5 441 | 1 408 | 1 182 | 833 | 800 |
| Birth weight, g | 3382.91 ±558.85 | 3185.42 ±518.73 | 3315.79 ±469.78 | 3208.88 ±504.10 | 3177.88 ±528.21 | 3221.91 ±473.36 | 3114.52 ±508.14 | 3362.01 ±559.40 | 3357.89 ±588.54 |
| Sex | |||||||||
| Male, n(%) | 118 317 (51.43) | 5267 (52.47) | 3860 (51.69) | 3050 (52.37) | 2827 (51.96) | 722 (51.28) | 598 (50.59) | 436 (52.34) | 411 (51.38) |
| Female, n(%) | 111 717 (48.57) | 4771 (47.53) | 3608 (48.31) | 2774 (47.63) | 2614 (48.04) | 686 (48.72) | 584 (49.41) | 397 (47.66) | 389 (48.63) |
| Gestational age | 38.84±1.78 | 38.72±1.70 | 38.87±1.51 | 38.73±1.61 | 38.44±1.76 | 38.69±1.58 | 38.54±1.83 | 39.10±1.82 | 38.57±1.89 |
| ≥37 weeks, n(%) | 212 989 (92.60) | 9357 (93.22) | 7106 (95.15) | 5447 (93.53) | 4990 (91.71) | 1322 (93.89) | 1097 (92.81) | 775 (93.04) | 744 (93) |
| 32–<37 weeks, n(%) | 15 320 (6.66) | 610 (6.08) | 328 (4.39) | 343 (5.89) | 405 (7.44) | 79 (5.61) | 71 (6.01) | 53 (6.36) | 47 (5.88) |
| 28–<32 weeks , n(%) | 1312 (0.57) | 50 (0.5) | 29 (0.39) | 26 (0.45) | 35 (0.64) | 5 (0.36) | 9 (0.76) | 3 (0.36) | 4 (0.5) |
| <28 weeks, n(%) | 413 (0.18) | 21 (0.21) | 5 (0.07) | 8 (0.14) | 11 (0.20) | 2 (0.14) | 5 (0.42) | 2 (0.24) | 5 (0.63) |
| Multigestation pregnancy, n(%) | 7819 (3.40) | 320 (3.19) | 171 (2.29) | 140 (2.40) | 97 (1.78) | 20 (1.42) | 19 (1.61) | 25 (3.00) | 34 (4.25) |
| Low birth weight (<2500 g), n(%) | 12 716 (5.52) | 787 (7.84) | 307 (4.12) | 410 (7.04) | 427 (7.84) | 72 (5.12) | 100 (8.47) | 48 (5.76) | 51 (6.38) |