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Table 2 Family characteristics of the non-overweight and overweight groups

From: Number of siblings, birth order, and childhood overweight: a population-based cross-sectional study in Japan

Variables Non-overweight (N = 3370) n(%) Overweight (N = 656) n(%) Pvaluea
Father’s age (years)
 <30 18 (0.6) 2 (0.3) 0.172
 30-39 1337 (42.3) 229 (37.9)
 40-49 1637 (51.8) 337 (55.7)
 50+ 169 (5.4) 37 (6.1)
Paternal overweight
 Yes 758 (22.5) 246 (37.5) <0.001
 No 2612 (77.5) 410 (62.5)
Mother’s age (years)
 <30 44 (1.3) 9 (1.4) 0.013
 30-39 2022 (61.6) 379 (60.1)
 40-49 1192 (36.3) 229 (36.3)
 50+ 26 (0.8) 14 (2.2)
Maternal overweight
 Yes 269 (8.0) 140 (21.3) <0.001
 No 3101 (92.0) 516 (78.7)
Number of siblings
 0 (only child) 328 (9.7) 95 (14.5) <0.001
 1 1855 (55.0) 360 (54.9)
 2 or more 1187 (35.2) 201 (30.6)
Birth order
 Only child 328 (9.7) 95 (14.5) <0.001
 Oldest child 1387 (41.2) 230 (35.1)
 Youngest child 1216 (36.1) 261 (39.8)
 Middle child 439 (13.0) 70 (10.7)
  1. aChi-squared test.