Description of the population, presence of concurrent diseases and survival times in control GSD (group 0), untreated dwarfs (group 1), dwarfs treated with levothyroxine (group 2), and dwarfs treated with levothyroxine and progestogens or GH (group 3).

Dichotomous response options (‘yes‘ or ‘no‘) were provided for the assessment of sex, adulthood, stature and concurrent diseases. Survival since diagnosis was grouped as follows: 1 = < 1 year survival; 2 = 1–2 year survival; 3 = 2–3 year survival; 4 = 4–5 year survival; 5 = > 5 year survival. Comparison between groups was performed by using one-way-ANOVA or Kruskal-Wallis test for numerical data and Chi-square two sample test for categorical data.