Total sample size (n) | 777 | | 489 | |

Total number of measurements | 9660 | | 7319 | |

Mean number of measurements per girl | 12.4 | | 15.0 | |

Mean height for age SDS (ages 0–10 y) | −2.44 | 1.13 | −0.31 | 1.05 |

Mean weight for age SDS (ages 0–10 y) | −1.74 | 1.28 | −0.12 | 1.05 |

Mean weight for height SDS (ages 0–10 y) | −0.06 | 1.29 | 0.12 | 1.04 |

Mean BMI for age SDS (ages 0–10 y) | −0.19 | 1.27 | 0.11 | 1.04 |

Height of both father and mother known | 357 | | 203 | |

Height of only one parent known | 3 | | 10 | |

Height of both parents unknown | 417 | | 276 | |

Mean father’s height (cm) | 179.4 | 7.50 | 178.4 | 7.57 |

Mean mother’s height (cm) | 166.4 | 6.29 | 166.7 | 7.38 |

Target height (cm) | 169.7 | 5.89 | 170.6 | 5.70 |

Target height SDS | 0.06 | 0.82 | 0.01 | 0.88 |

Gestational age (weeks) | 38.9 | 2.07 | 39.7 | 1.61 |

Dysmorphic features (%) (n = 145) |

Cubitus valgus | 31 | | | |

Large inter-nipple distance | 29 | | | |

Low hair implantation | 21 | | | |

Webbed neck | 19 | | | |

Karyotype (%) (n = 327) |

45,X | 62 | | | |

46,X,iX or 46,X,idic(X) | 5 | | | |

45,X and 46,XX | 5 | | | |

45,X and (46,X,iX or 46,X,idic(X)) | 12 | | | |

Other | 16 | | | |

Median age of diagnosis of TS (years) (n = 46) |

45,X (n = 27) | 6.9 | 4.94 | | |

Other (n = 19) | 10.4 | 4.81 | | |