Table 1 Maternal characteristics presented by neonatal birth weight [n(%)]
Items | Total N = 3585 | SGA | AGA | LGA | χ2/H | P |
|---|---|---|---|---|---|---|
N = 207 | N = 3000 | N = 378 | ||||
Age | Â | Â | Â | Â | 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 | Â | Â | Â | Â | 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 | Â | Â | Â | Â | 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 | Â | Â | Â | Â | 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 | Â | Â | Â | Â | 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) | Â | Â | Â | 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 | Â | Â | Â | Â | 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 | Â | Â | Â | 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 | Â | Â | Â | Â | 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 | Â | Â | Â | Â | 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 | Â | Â | Â | 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 |