. Smirnov, Le choix du test a été fait en fonction du résultat du test de normalité des distributions : t-test pairé ou test de Wilcoxon. Les tests de comparaison de groupe ont été réalisés soit en utilisant un test de Student soit un test de Mann-Whitney en fonction de la normalité ou non des distributions. Pour les variables catégorielles, les comparaisons entre groupes ont été réalisées à l'aide d'un test du Khi". Un p<0.05 est considéré comme significatif. De plus, des sous analyses ont été conduites, basées sur des stratifications du groupe d'étude en fonction du genre, de la présence de fracture (Oui/non), et statut de la maladie une analyse de variance ANOVA a été réalisée. Les tests post-hoc ont été réalisés par des tests de Student-Newman-Keuls

. Dans-notre-Étude-transversale and D. Et-de-la, rachis et ESFT) de notre échantillon total de patients à T0 (inclusion) avec les valeurs normales de références pour l'âge et le sexe (Z-score). Ensuite, après stratification de notre échantillon total, nous avons comparé les valeurs de DMO et du TBS : -de chaque catégorie entres elles et -aux valeurs normales pour l'âge et le sexe

. Dans-notre-Étude-longitudinale, nous avons comparé les valeurs du TBS et de la DMO (rachis et ESFT) obtenues à T0 et T1 (après traitement chirurgical) : le patient était son propre témoin

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T. La-ligne-continue-représente-la-moyenne-des-valeurs-du, Les pointillés représentent les deux dérivations standards. La ligne claire horizontale représente les sujets de la cohorte française de l'étude. La courbe est divisée en deux parties avant et après 65 ans. La pente du TBS augmente de 50% par année après 65 ans, p.5