Minimum–maximum | Categories | Cut-off values | n | n (%) |

Birth weight (537–5300 g) | ⩽10th percentile | ⩽2860 g | 2869 | 288 (10.0) |

10th–90th percentile | >2860 to <4200 g | 2289 (79.8) | ||

⩾90th percentile | ⩾4200 g | 292 (10.2) | ||

Birth length (29–58 cm) | ⩽10th percentile | ⩽47 cm | 2839 | 325 (11.4) |

10th–90th percentile | >47 to <53 cm | 2100 (74.0) | ||

⩾90th percentile | ⩾53 cm | 414 (14.6) | ||

Body mass index at age 4 (12.8–23.9 kg/m^{2}) | ⩽10th percentile | ⩽14.7 kg/m^{2} | 2846 | 279 (9.8) |

10th–90th percentile | >14.7 to <18.0 kg/m^{2} | 2294 (80.6) | ||

⩾90th percentile | ⩾18.0 kg/m^{2} | 273 (9.6) |

Body mass index was calculated as body weight in kilograms divided by the square of the height in metres (kg/m

^{2}). Some values for birth length (n = 30) and body mass index at age 4 (n = 23) are missing.