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Table 4 Adjusted odds ratios of number of younger/older siblings for overweight

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

Variables Total N Overweight n (%) AOR (95% CI)
Number of younger siblings
 0 (Only child) 423 95 (22.5) 1.00
 1 (Oldest child) 1190 173 (14.5) 0.50 (0.36-0.70)
 2 or more (Oldest child) 427 57 (13.4) 0.33 (0.21-0.51)
    P for trend <0.001
Number of older siblings
 0 (Only child) 423 95 (22.5) 1.00
 1 (Youngest child) 1025 187 (18.2) 0.73 (0.53-1.01)
 2 or more (Youngest child) 452 74 (16.4) 0.70 (0.47-1.05)
    P for trend = 0.078
  1. AOR: adjusted odds ratio, CI: confidence interval.
  2. Adjusted for sex, birth weight, eating speed, exercise, sleeping hours, mother’s age, paternal overweight, and maternal overweight.