Table 1 Basic characteristics of the mother-child pairs
Variables | Birth weight(n = 490,143) | Low birth weight(n = 7146) | Macrosomia(n = 29,457) | ||||
|---|---|---|---|---|---|---|---|
N (%) | Mean ± SD(g) | F | N(%) | χ2 | N(%) | χ2 | |
Gestational age(weeks) | 51543.00* | 15294.00* | 7197.40* | ||||
37–37+ 6 | 36,138(7.4) | 3020.404 ± 422.075 | 3125(8.6) | 498(1.4) | |||
38–38+ 6 | 98,636 (20.1) | 3247.870 ± 396.350 | 1994(2.0) | 2946(3.0) | |||
39–39+ 6 | 162,966 (33.2) | 3369.093 ± 394.169 | 1312(0.8) | 8442(5.2) | |||
40–40+ 6 | 138,209 (28.2) | 3462.910 ± 400.804 | 590(0.4) | 11,373(8.2) | |||
41–41+ 6 | 54,194(11.1) | 3545.406 ± 395.768 | 125(0.2) | 6198(11.4) | |||
Season of birth | 24.01* | 13.97* | 36.51* | ||||
Spring | 119,481(24.4) | 3363.061 ± 422.333 | 1806(1.5) | 7137(5.9) | |||
Summer | 121,425(24.8) | 3360.024 ± 18.322 | 1859(1.5) | 6932(5.7) | |||
Autumn | 128,548(26.2) | 3367.011 ± 419.182 | 1773(1.4) | 7806(6.1) | |||
Winter | 120,689(24.6) | 3369.533 ± 422.324 | 1708(1.4) | 7582(6.3) | |||
Maternal residence | 243.76* | 58.42* | 40.42* | ||||
Urban | 245,250(50.1) | 3372.876 ± 416.985 | 3370(1.4) | 15,193(6.2) | |||
Suburb | 128,008(26.1) | 3363.916 ± 422.330 | 1800(1.4) | 7648(6.0) | |||
Countryside | 116,885(23.8) | 3349.401 ± 425.485 | 1976(1.7) | 6616(5.7) | |||
Ethnicity | 0.975 | 0.265 | 1.165 | ||||
Han | 485,192(99.0) | 3364.998 ± 420.453 | 7069(1.5) | 29,141(6.0) | |||
Other | 4951 (1.0) | 3359.067 ± 427.861 | 77(1.6) | 316(6.4) | |||