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Table 1 Maternal characteristics presented by neonatal birth weight [n(%)]

From: Association among pre-pregnancy body mass index, gestational weight gain and neonatal birth weight: a prospective cohort study in China

Items Total
N = 3585
SGA AGA LGA χ2/H P
N = 207 N = 3000 N = 378
Age      3.004 0.048
 < 25 576 (16.07) 37 (17.87) 482 (16.07) 57 (15.08)   
 25~ 1804 (50.32) 113 (54.59) 1516 (50.53) 175 (46.30)   
 30~ 859 (23.96) 39 (18.84) 721 (24.03) 99 (26.19)   
 35~ 346 (9.65) 18 (8.70) 281 (9.37) 47 (12.43)   
Ethnicity      3.044 0.218
 Han 3413 (95.20) 192 (92.75) 2859 (95.30) 362 (95.77)   
 Minority 172 (4.80) 15 (7.25) 141 (4.70) 16 (4.23)   
Residential Areas      0.425 0.809
 Urban 1594 (44.46) 90 (43.48) 1341 (44.70) 163 (43.12)   
 Rural 1991 (55.37) 117 (56.52) 1659 (55.30) 215 (56.88)   
Educational level      10.422 0.108
 Less than high school 508 (14.17) 21 (10.15) 418 (13.93) 69 (18.26)   
 High school 765 (21.34) 42 (20.29) 648 (21.60) 75 (19.84)   
 Bachelor 2082 (58.07) 133 (64.25) 1735 (57.84) 214 (56.61)   
 Master or above 230 (6.42) 11 (5.31) 199 (6.63) 20 (5.29)   
Occupation      14.378 0.026
 No 1064 (29.68) 42 (20.29) 908 (30.27) 114 (30.16)   
 Yes 2521 (70.32) 165 (79.71) 2092 (69.73) 264 (69.84)   
Annual household Income (thousand)     3.628 0.459
 < 70 959 (26.75) 44 (21.26) 816 (27.20) 99 (26.19)   
 70~ 1656 (46.19) 104 (50.24) 1375 (45.83) 177 (46.83)   
 200~ 970 (27.06) 59 (28.50) 809 (26.97) 102 (26.98)   
Smoking      0.881 0.644
 No 3424 (95.51) 195 (94.20) 2868 (95.60) 361 (95.50)   
 Yes 161 (4.49) 12 (5.80) 132 (4.40) 17 (4.50)   
Alcohol consumption     0.718 0.698
 No 3325 (92.75) 189 (91.30) 2786 (92.87) 350 (92.60)   
 Yes 260 (7.25) 18 (8.70) 214 (7.13) 28 (7.40)   
Gravidity      30.204 < 0.001
 0 1085 (30.27) 96 (46.38) 883 (29.43) 106 (28.04)   
 1 1192 (33.25) 53 (25.60) 1020 (34.00) 119 (31.48)   
 2 755 (21.06) 35 (16.91) 627 (20.90) 93 (24.60)   
 ≥ 3 553 (15.42) 23 (11.11) 470 (15.67) 60 (15.88)   
Parity      8.236 0.021
 0 2080 (58.02) 136 (65.70) 1733 (57.77) 211 (55.82)   
 1 1292 (36.04) 63 (30.44) 1085 (36.17) 144 (38.10)   
 2 145 (4.05) 4 (1.93) 123 (4.10) 18 (4.76)   
 ≥ 3 68 (1.89) 4 (1.93) 59 (1.96) 5 (1.32)   
GMD      6.122 0.047
 No 3089 (86.17) 179 (86.47) 2600 (86.67) 310 (82.01)   
 Yes 496 (13.83) 28 (13.53) 400 (13.33) 68 (17.99)   
Gestational Hypertension     8.611 0.013
 No 3475 (96.93) 194 (93.72) 2917 (97.23) 364 (96.30)   
 Yes 110 (3.07) 13 (6.28) 83 (2.77) 14 (3.70)   
Gestational Week 39.23 ± 1.44 39.15 ± 1.54 39.24 ± 1.43 39.13 ± 1.50 3.018 0.221