Table 1

Descriptive statistics by paternal age, for siblings born between 1987 and 2000

Paternal age in yearsLBW (%)Preterm (%)Birth year 1987–1990Birth year 1991–1994Birth year 1995–2000Birth order (mean)Household income decile (mean)Mother smoked during pregnancy (%)Household high education (%)Maternal age (mean)n%
≤242.94.035.633.830.61.43.723.617.822.210 77410.1
25–292.03.531.236.032.81.75.212.837.026.234 52632.4
30–341.93.321.935.143.12.06.010.340.529.636 32034.1
35–392.23.716.531.652.02.46.19.739.332.717 57116.5
≥402.84.515.530.054.52.56.011.235.735.174617.0
Average2.23.624.934.340.81.95.512.436.628.6106 652
  • LBW, low birth weight.