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Table 2 Family 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 %
Father’s weight status          19.60 0.001
 Underweight 1594 3.25 203 2.96 288 2.48 2085 3.09   
 Normal 30,935 63.01 4353 63.53 7394 63.60 42,682 63.16   
 Overweight 12,667 25.80 1788 26.09 2946 25.34 17,401 25.75   
 Missing 3901 7.95 508 7.41 997 8.58 5406 8.00   
 Total 49,097 100.00 6852 100.00 11,625 100.00 67,574 100.00   
Father’s education level          10,349.70 < 0.001
 Low 8524 17.36 2416 35.26 7275 62.58 18,215 26.96   
 Middle 22,081 44.97 2386 34.82 3137 26.98 27,604 40.85   
 High 18,292 37.26 2023 29.52 1162 10.00 21,477 31.78   
 Missing 200 0.41 27 0.39 51 0.44 278 0.41   
 Total 49,097 100.00 6852 100.00 11,625 100.00 67,574 100.00   
Mother’s weight status          509.04 < 0.001
 Underweight 5260 10.71 579 8.45 726 6.25 6565 9.72   
 Normal 35,611 72.53 4982 72.71 8193 70.48 48,786 72.20   
 Overweight 4794 9.76 840 12.26 1807 15.54 7441 11.01   
 Missing 3432 6.99 451 6.58 899 7.73 4782 7.08   
 Total 49,097 100.00 6852 100.00 11,625 100.00 67,574 100.00   
Mother’s education level          12,096.00 < 0.001
 Low 9842 20.05 2691 39.27 8306 71.45 20,839 30.84   
 Middle 22,742 46.32 2511 36.65 2475 21.29 27,728 41.03   
 High 16,450 33.51 1632 23.82 823 7.08 18,905 27.98   
 Missing 63 0.13 18 0.26 21 0.18 102 0.15   
 Total 49,097 100.00 6852 100.00 11,625 100.00 67,574 100.00   
Family income          3362.13 < 0.001
 Low 10,257 20.89 1828 26.68 5368 46.18 17,453 25.83   
 Middle 29,251 59.58 3322 48.48 4862 41.82 37,435 55.40   
 High 9563 19.48 1694 24.72 1388 11.94 12,645 18.71   
 Missing 26 0.05 8 0.12 7 0.06 41 0.06   
 Total 49,097 100.00 6852 100.00 11,625 100.00 67,574 100.00   
Residential site          1241.61 < 0.001
 Suburban 36,765 74.88 5567 81.25 10,421 89.64 52,753 78.07   
 Urban 12,313 25.08 1284 18.74 1200 10.32 14,797 21.90   
 Missing 19 0.04 1 0.01 4 0.03 24 0.04   
 Total 49,097 100.00 6852 100.00 11,625 100.00 67,574 100.00   
  1. aP Value from Chi-squared test