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. 2021 Jul 22;11:15016. doi: 10.1038/s41598-021-94375-2

Table 2.

The prevalence of LBW among Chinese children under 6 years in 2013.

Characteristics Total Boys Girls
Total Number % 95% CI Total Number % 95% CI Total Number % 95% CI
Totala 31,969 5.15 5.01, 5.33 16,439 4.57 4.39, 4.80 15,530 5.68 5.41, 5.98
Age groups (months)
0–11 8682 4.78 4.47, 5.07 4436 4.15 3.76, 4.56 4246 5.33 4.87, 5.81
12–23 5172 5.27 4.85, 5.73 2704 4.85 4.33, 5.46 2468 5.62 5.00, 6.30
24–35 4515 5.48 5.04, 5.97 2326 4.88 4.31, 5.51 2189 6.08 5.31, 6.81
36–47 4748 5.34 4.90, 5.82 2454 4.48 3.96, 5.15 2294 6.29 5.52, 6.99
48–59 4599 5.29 4.84, 5.77 2357 4.79 4.25, 5.50 2242 5.75 5.12, 6.44
60–71 4253 5.18 4.64, 5.67 2162 4.69 4.06, 5.33 2091 5.49 4.84, 6.29
Residential area
East China 11,600 4.60 4.32, 4.88 5918 4.08 3.79, 4.45 5682 5.15 4.73, 5.60
Central China 10,054 3.75 3.52, 4.01 5193 3.35 3.03, 3.69 4861 4.13 3.77, 4.56
West China 10,315 7.34 6.95, 7.72 5328 6.58 6.07, 7.01 4987 8.02 7.44, 8.64
Urban
Subtotal 16,421 4.75 4.55, 4.99 8361 4.20 3.91, 4.54 8060 5.22 4.91, 5.64
Large cities 7256 4.14 3.80, 4.42 3666 3.57 3.17, 3.99 3590 4.60 4.16, 5.14
Medium and small cities 9165 5.28 4.97, 5.63 4695 4.76 4.35, 5.21 4470 5.80 5.33, 6.32
Rural
Subtotal 15,548 5.57 5.36, 5.86 8078 5.00 4.69, 5.32 7470 6.21 5.75, 6.58
Non-poor rural areas 10,451 4.85 4.57, 5.15 5398 4.26 3.95, 4.67 5053 5.44 4.98, 5.91
Poor rural areas 5097 6.61 6.68, 7.58 2680 6.53 5.90, 7.23 2417 7.77 7.06, 8.69
Ethnicity
Han 27,828 4.83 4.66, 5.00 14,238 4.24 3.99, 4.48 13,590 5.43 5.15, 5.64
Minority 4132 7.52 6.94, 8.11 2196 7.14 6.38, 7.98 1936 7.76 6.98, 8.77
Maternal age groups
 < 20 years 351 8.84 6.77, 11.39 178 7.61 5.20, 11.04 173 10.24 7.01, 14.45
20–25 years 7558 5.19 4.81, 5.52 3880 4.91 4.41, 5.39 3678 5.40 4.92, 6.00
26–30 years 11,213 4.59 4.33, 4.87 5914 3.94 3.66, 4.30 5299 5.19 4.77, 5.63
31–35 years 7278 4.63 4.25, 4.94 3727 3.99 3.60, 4.47 3551 5.17 4.71, 5.78
 > 35 years 3752 5.93 5.42, 6.48 1974 5.11 4.47, 5.85 1778 6.79 5.95, 7.72
Maternal education
Primary or below 3758 7.24 6.69, 7.97 2048 6.17 5.52, 7.00 1710 8.46 7.46, 9.53
Junior high school 14,331 5.07 4.86, 5.34 7479 4.62 4.27, 4.93 6852 5.54 5.21, 5.99
High school 5535 4.43 4.12, 4.83 2885 3.78 3.34, 4.23 2650 5.20 4.63, 5.84
Associate's degree 3372 4.44 3.95, 4.94 1661 4.26 3.63, 4.99 1711 4.48 3.83, 5.20
Bachelor's degree or above 3331 3.65 3.26, 4.14 1686 3.10 2.58, 3.68 1645 4.30 3.66, 5.02
Annual household income (per capital CNY)b
< 10,000 11,102 6.42 6.08, 6.77 5759 5.70 5.26, 6.07 5343 7.11 6.70, 7.68
10,000–19,999 8815 4.60 4.25, 4.92 4550 4.25 3.85, 4.67 4265 4.84 4.42, 5.32
≥ 20,000 8819 4.18 3.92, 4.55 4491 3.68 3.34, 4.07 4328 4.69 4.27, 5.15

aInformation on preterm was missing for 307 subjects.

b3251 of subjects refused to answer the question about annual household income.