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Table 3 Crude and adjusted odds ratios of number of siblings and birth order for overweight

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

Variables Total N Overweight n (%) Crude Adjusteda
    OR 95% CI OR 95% CI
Number of siblings (%)
 0 (only child) 423 95 (22.5) 1.00   1.00  
 1 2215 360 (16.3) 0.67 0.52-0.86 0.62 0.46-0.83
 2 or more 1388 201 (14.5) 0.59 0.45-0.77 0.50 0.36-0.68
    P for trend < 0.001   P for trend < 0.001  
Birth order (%)
 Only child 423 95 (22.5) 1.82 1.29-2.55 2.13 1.45-3.14
 Oldest child 1617 230 (14.2) 1.04 0.78-1.39 1.01 0.73-1.40
 Youngest child 1477 261 (17.7) 1.35 1.01-1.79 1.56 1.13-2.16
 Middle child 509 70 (13.8) 1.00   1.00  
  1. OR; odds ratio; CI: confidence interval.
  2. aAdjusted for sex, birth weight, eating speed, exercise, sleeping hours, mother’s age, paternal overweight, and maternal overweight.