Table 5.

Scores of articles rated by COSMIN checklist

Authors (year)	Measurement properties assessed	IRT used	Score IRT	A*	B*	C*	D*	E*	F*	G*	I*	J*	Generalisability per box
Chirstensen et al. (2003) [21]	Internal consistency Reliability Content validity Hypotheses testing	No		+	0		+		+				++ A ++ B ++ D ++ F
Martin et al. (2006) [22]	Internal consistency Hypothesis testing Structural validity	Yes	++	++				+	+				+++ IRT +++ A +++ E +++ F
Martin et al. (2007) [23]	Hypothesis testing Structural validity Interpretability	No						++	+			++	++ E ++ F ++ J
Martin et al. (2008) [24]	Reliability Responsivenss Interpretability	No			+						+	+	0 B ++ I ++ J
Potter et al. (2005) [20]	Construct validity	No							+++				+++ F

+++ = excellent. ++ = good. + = fair. 0 = poor. Empty boxes = not applicable. IRT = Item Response Theory. * = A = internal consistency. B = reliability. C = measurement error. D = content validity. E = structural validity. F = hypothesis testing. G = cross-cultural validity. H = criterion validity. I = responsiveness. J = interpretability.