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Table 1 Characteristics of study participants by the number of siblings

From: Association of number of siblings, birth order, and thinness in 3- to 12-year-old children: a population-based cross-sectional study in Shanghai, China

Variables None (only child) One Two or more Total χ2 P valuea
N % N % N % N %
Sex          32.94 < 0.001
 Boy 26,351 53.67 3457 50.45 6027 51.85 35,835 53.03   
 Girl 22,746 46.33 3395 49.55 5598 48.15 31,739 46.97   
 Total 49,097 100.00 6852 100.00 11,625 100.00 67,574 100.00   
Birth weight (g)          4.77 0.029
 < 2500 1631 3.32 417 6.09 939 8.08 2987 4.42   
 2500–4000 41,584 84.70 5532 80.74 8712 74.94 55,828 82.62   
 ≥ 4000 4883 9.95 722 10.54 1393 11.98 6998 10.36   
 Missing 999 2.03 181 2.64 581 5.00 1761 2.61   
 Total 49,097 100.00 6852 100.00 11,625 100.00 67,574 100.00   
Feeding patterns          8475.14 < 0.001
 Breast Feeding 21,893 44.59 3546 51.75 7411 63.75 32,850 48.61   
 Formulary Feeding 7957 16.21 1054 15.38 1674 14.40 10,685 15.81   
 Mixed Feeding 18,965 38.63 2194 32.02 2391 20.57 23,550 34.85   
 Missing 282 0.57 58 0.85 149 1.28 489 0.72   
 Total 49,097 100.00 6852 100.00 11,625 100.00 67,574 100.00   
Workday TV time (hour/day)          41,614.76 < 0.001
 < 1 29,037 59.14 3762 54.90 5484 47.17 38,283 56.65   
 1–3 18,353 37.38 2843 41.49 5534 47.60 26,730 39.56   
 > 3 990 2.02 135 1.97 303 2.61 1428 2.11   
 Missing 717 1.46 112 1.63 304 2.62 1133 1.68   
 Total 49,097 100.00 6852 100.00 11,625 100.00 67,574 100.00   
Internet use time (hour/week)          33,821.76 < 0.001
 < 2 30,086 61.28 4518 65.94 7930 68.22 42,534 62.94   
 2–4 11,235 22.88 1346 19.64 1742 14.98 14,323 21.20   
 ≥ 4 6301 12.83 717 10.46 769 6.62 7787 11.52   
 Missing 1475 3.00 271 3.96 1184 10.18 2930 4.34   
 Total 49,097 100.00 6852 100.00 11,625 100.00 67,574 100.00   
Snack frequency (times/day)          37,680.69 < 0.001
 0 14,854 30.25 1951 28.47 2716 23.36 19,521 28.89   
 1–3 30,643 62.41 4355 63.56 7724 66.44 42,722 63.22   
 > 3 2994 6.10 458 6.68 846 7.28 4298 6.36   
 Missing 606 1.23 88 1.28 339 2.92 1033 1.53   
 Total 49,097 100.00 6852 100.00 11,625 100.00 67,574 100.00   
Father’s age at child birth (years)          976.81 < 0.001
 < 25 7217 14.70 1119 16.33 2263 19.47 10,599 15.69   
 25–34 33,800 68.84 4078 59.52 6264 53.88 44,142 65.32   
 ≥ 35 4918 10.02 1142 16.67 1902 16.36 7962 11.78   
 Missing 3162 6.44 513 7.49 1196 10.29 4871 7.21   
 Total 49,097 100.00 6852 100.00 11,625 100.00 67,574 100.00   
Mother’s age at child birth (years)          1518.61 < 0.001
 < 25 15,672 31.92 2092 30.53 3872 33.31 21,636 32.02   
 25–34 30,882 62.90 3985 58.16 5933 51.04 40,800 60.38   
 ≥ 35 1409 2.87 571 8.33 1173 10.09 3153 4.67   
 Missing 1134 2.31 204 2.98 647 5.57 1985 2.94   
 Total 49,097 100.00 6852 100.00 11,625 100.00 67,574 100.00   
  1. aP Value from Chi-squared test