Logistic analysis of football position and birth position (all siblings and male siblings only), adjusted for family size

Odds ratio* for being eldest (all siblings)95% confidence intervalOdds ratio* for being eldest male sibling (male siblings only)95% confidence interval
Goalkeeper0.610.19 to 2.010.760.39 to 2.91
Defender1.030.52 to 2.031.770.83 to 3.80
Midfield1.540.75 to 3.151.000.45 to 2.22
Forward0.760.37 to 1.590.600.27 to 1.33
  • * Control group is youngest sibling (odds ratio 1.0).

  • † P=0.21.