Table 1.
Sociodemographic, maternal pregnancy and birth-related characteristics comparing infant birth weight.
| Characteristics | After live birth (n = 9663) | After termination (n = 3400) | ||||||
|---|---|---|---|---|---|---|---|---|
| n (%) | BW (g, ± s) | β | p-value | n (%) | BW (g, ±s) | β | p-value | |
| Residence | ||||||||
| Rural | 8666(89.68) | 3259.74 ± 467.09 | −93.09 | <0.0001 | 2641(77.68) | 3281.30 ± 484.78 | −73.49 | 0.0002 |
| Urban (Ref.) | 997(10.32) | 3352.83 ± 458.79 | 759(22.32) | 3354.80 ± 460.41 | ||||
| Infant gender | ||||||||
| Female | 4170(43.15) | 3200.74 ± 457.90 | −120.68 | <0.0001 | 1519(44.68) | 3226.70 ± 486.54 | −128.36 | <0.0001 |
| Male (Ref.) | 5493(56.85) | 3321.42 ± 467.28 | 1881(55.32) | 3355.06 ± 486.54 | ||||
| Gestational age | ||||||||
| <37 weeks | 254(2.63) | 2713.46 ± 694.77 | −568.64 | <0.0001 | 111(3.26) | 2628.73 ± 649.01 | −686.30 | <0.0001 |
| 37 to 41 weeks (Ref.) | 9203(95.24) | 3282.10 ± 449.05 | 3201(94.15) | 3315.03 ± 452.66 | ||||
| >41 weeks | 206(2.13) | 3384.93 ± 480.94 | 102.83 | 0.0014 | 88(2.59) | 3511.59 ± 563.36 | 196.56 | <0.0001 |
| Maternal age | ||||||||
| <20 years old | 123(1.27) | 3229.67 ± 465.17 | −49.16 | 0.2465 | 46(1.35) | 3380.43 ± 340.83 | 74.59 | 0.2956 |
| 20 to 35 years old (Ref.) | 7741(80.11) | 3278.83 ± 461.08 | 2907(85.50) | 3305.85 ± 470.98 | ||||
| >35 years old | 1799(18.62) | 3231.23 ± 490.44 | −47.61 | <0.0001 | 447(13.15) | 3236.29 ± 544.54 | −69.56 | 0.0044 |
| Maternal education | ||||||||
| Primary school or below | 2089(21.62) | 3215.77 ± 500.24 | −57.69 | <0.0001 | 397(11.68) | 3201.38 ± 474.23 | −74.81 | 0.0051 |
| Junior high school | 5838(60.42) | 3273.46 ± 456.52 | 1652(48.59) | 3276.20 ± 491.46 | ||||
| Senior high school or above (Ref.) | 1736(17.97) | 3319.98 ± 454.43 | 46.52 | 0.0003 | 1351(39.74) | 3352.33 ± 461.85 | 76.13 | <0.0001 |
| Ethnicity | ||||||||
| Minority | 49(0.51) | 3142.45 ± 465.45 | −127.54 | 0.0566 | 38(1.12) | 3359.21 ± 437.72 | 62.20 | 0.4275 |
| Han (Ref.) | 9614(99.49) | 3269.99 ± 467.02 | 3362(98.88) | 3297.01 ± 480.83 | ||||
| Gravidity | ||||||||
| >2 times | 1176(12.17) | 3272.94 ± 497.05 | 4.09 | 0.7784 | 1760(51.76) | 3305.67 ± 489.92 | 16.50 | 0.3169 |
| 2 times (Ref.) | 8487(87.83) | 3268.85 ± 462.80 | 1640(48.24) | 3289.17 ± 469.87 | ||||
| Maternal job | ||||||||
| Homemaker or farmer | 7514(77.76) | 3259.53 ± 468.61 | −44.13 | 0.0001 | 2188(64.35) | 3272.06 ± 482.44 | −71.97 | <0.0001 |
| Employee (Ref.) | 2149(22.24) | 3303.66 ± 460.13 | 1212(35.65) | 3344.02 ± 473.24 | ||||
| PIH | ||||||||
| Yes | 157(1.62) | 3103.69 ± 601.88 | −168.48 | <0.0001 | 80(2.35) | 3044.75 ± 596.27 | −259.06 | <0.0001 |
| No (Ref.) | 9506(98.38) | 3272.08 ± 464.06 | 3320(97.65) | 3303.81 ± 475.67 | ||||
| Economic status | ||||||||
| Low (lowest 25) | 2014(20.84) | 3232.38 ± 458.11 | −30.05 | 0.0134 | 588(17.29) | 3258.26 ± 509.51 | −29.48 | 0.2040 |
| Middle (medium 50) (Ref.) | 5482(56.73) | 3262.43 ± 468.70 | 1566(36.65) | 3287.74 ± 485.35 | ||||
| High (top 25) | 2167(22.43) | 3321.19 ± 458.11 | 58.76 | <0.0001 | 1246(36.65) | 3328.86 ± 457.82 | 41.12 | 0.0240 |