Rebonjour, Merci de m'avoir répondu... Voici le code reproductible de mon df: df<-structure(list(median_age_1 = c(NA, NA, NA, NA, NA, NA, 83), median_age_2 = c(NA, NA, NA, NA, NA, NA, 86), median_age_3 = c(NA_real_, NA_real_, NA_real_, NA_real_, NA_real_, NA_real_, NA_real_ ), median_age_4 = c(NA_in...