Table 1 Demographic characteristics of female participants by paternal smoking
Characteristics | Without paternal smoking (N = 3,760,013) | Paternal smoking (N = 1,538,030) | P-value |
|---|---|---|---|
Maternal age at LMP, years | < 0.001 | ||
20–24 | 1,854,321 (49.32) | 787,071 (51.17) | |
25–29 | 1,435,650 (38.18) | 552,020 (35.89) | |
20–34 | 370,544 (9.85) | 155,818 (10.13) | |
34–39 | 84,127 (2.24) | 36,769 (2.39) | |
≥ 40 | 15,371 (0.41) | 6352 (0.41) | |
Paternal age at LMP, years | 0.698 | ||
20–24 | 1,187,331 (31.58) | 513,454 (33.38) | |
25–29 | 1,723,283 (45.83) | 663,335 (43.13) | |
20–34 | 608,613 (16.19) | 251,416 (16.35) | |
34–39 | 175,640 (4.67) | 80,289 (5.22) | |
≥ 40 | 51,510 (1.37) | 23,516 (1.53) | |
NA | 13,636 (0.36) | 6020 (0.39) | |
Higher education, N (%) | 478,692 (12.73) | 169,000 (10.99) | < 0.001 |
Han Chinese ethnic, N (%) | 3,466,467 (92.19) | 1,396,953 (90.83) | < 0.001 |
BMI | ef | 0.015 | |
Underweight | 505,479 (13.44) | 249,029 (16.19) | |
Normal weight | 2,750,542,(73.15) | 1,058,090 (68.80) | |
Over weight | 401,370 (10.67) | 184,711 (12.01) | |
Obese | 81,635 (2.17) | 42,358 (2.75) | |
NA | 20,987 (0.56) | 3842 (0.25) | |
Alcohol drinking, ml/day | < 0.001 | ||
No | 3,682,327 (97.93) | 1,479,682 (96.21) | |
1–10 | 7943 (0.21) | 7113 (0.46) | |
11–50 | 6172 (0.16) | 5652 (0.37) | |
≥ 51 | 2535 (0.07) | 2531 (0.16) | |
NA | 61,036 (1.62) | 43,052 (2.80) | |
Primipara, No. (%) | 2,655,253 (70.62) | 1,010,155 (65.68) | < 0.001 |
History of adverse pregnancy outcome, N (%) | 93,903 (2.50) | 67,638 (4.40) | < 0.001 |
Maternal passive smoking, min/day | < 0.001 | ||
No | 3,677,977 (97.82) | 1,377,704 (89.58) | |
1–15 | 52,305 (1.39) | 97,893 (6.36) | |
≥ 16 | 23,515 (0.63) | 59,690 (3.88) | |
NA | 6216 (0.17) | 2743 (0.18) | |
Paternal passive smoking, min/day | < 0.001 | ||
No | 3,619,027 (96.25) | 1,173,620 (76.31) | |
1–15 | 80,040 (2.13) | 165,487 (10.76) | |
≥ 16 | 52,868 (1.41) | 192,236 (12.50) | |
NA | 8078 (0.21) | 6687 (0.43) |