Table 1 Descriptive characteristics of participants
Characteristics | Total (n = 5240828) | Preterm (n = 209014) | Non-Preterm (n = 5031814) |
|---|---|---|---|
Gestational age (weeks, mean (SD)) | 39.18 (1.41) | 34.97 (2.06) | 39.36 (1.06) |
Maternal age, n (%) | |||
鈥�< 35 years | 4796513 (91.52) | 183856 (87.96) | 4612657 (91.67) |
鈥冣墺 35 years | 444315 (8.48) | 25158 (12.04) | 419157 (8.33) |
Neonate鈥檚 sex, n (%) | |||
鈥僊补濒别 | 2741340 (52.31) | 123679 (59.17) | 2617661 (52.02) |
鈥僃别尘补濒别 | 2470859 (47.15) | 84032 (40.20) | 2386827 (47.43) |
鈥僊颈蝉蝉颈苍驳 | 28629 (0.55) | 1303 (0.62) | 27326 (0.54) |
Gravidity, n (%) | |||
鈥僘别蝉 | 3052010 (58.24) | 121127 (57.95) | 2930883 (58.25) |
鈥僋辞 | 1682737 (32.11) | 70738 (33.84) | 1611999 (32.04) |
鈥僊颈蝉蝉颈苍驳 | 506081 (9.66) | 17149 (8.20) | 488932 (9.72) |
Parity, n (%) | |||
鈥僘别蝉 | 2649919 (50.56) | 103347 (49.45) | 2546572 (50.61) |
鈥僋辞 | 2091446 (39.91) | 89044 (42.60) | 2002402 (39.79) |
鈥僊颈蝉蝉颈苍驳 | 499463 (9.53) | 16623 (8.04) | 482840 (9.60) |
Birthing season, n (%) | |||
鈥侨辫谤颈苍驳 | 1264967 (24.14) | 50361 (24.09) | 1214606 (24.14) |
鈥侨耻尘尘别谤 | 1398909 (26.69) | 55540 (26.57) | 1343369 (26.70) |
鈥倾耻迟耻尘苍 | 1538014 (29.35) | 58773 (28.12) | 1479241 (29.40) |
鈥僕颈苍迟别谤 | 1038938 (19.82) | 44340 (21.21) | 994598 (19.77) |