Fig. 1From: Assessing the effect of child’s gender on their father–mother perception of the PedsQL™ 4.0 questionnaire: an iterative hybrid ordinal logistic regression/item response theory approach with Monte Carlo simulationComparison of father–daughter invariance to mother–daughter invariance (first row) and father–son invariance to mother–son invariance (second row) in item 5 in the physical subscaleBack to article page