Table 4.

Methodological quality, based on COSMIN criteria,³¹ of the eight studies reporting measurement properties in the context of instrument validation.

Instrument	First author, year	BOX A: internal consistency	BOX B: reliability	BOX C: measurement error	BOX D: content validity	BOX E: structural validity	BOX F: hypothesis testing	BOX G: cross-cultural validity	BOX H: criterion validity	BOX I: responsiveness
SAHD	Rosenfeld, 199921	Excellent			Excellent	Excellent	Excellent		Good
SAHD	Rosenfeld, 200024	Good	Fairb		Excellent	Good	Good		Good
Modified DDRS	Kelly, 20021	Good				Good			Poor
SAHD	Mystakidou, 200425	Excellent	Excellenta,b		Excellent	Excellent	Fair	Goodc	Good
SISC	Wilson, 200433		Gooda,b		Excellent		Poor		Good
SAHD	Shim, 201113	Good						Fairc
SAHD	Villavicencio-Chávez, 201415	Excellent			Excellent	Excellent	Poor	Goodc	Good
SAHD	Galushko, 201526	Good			Excellent	Good	Fair	Fairc	Good

DDRS: Desire for Death Rating Scale; SAHD: Schedule of Attitudes toward Hastened Death; SISC: Structured Interview for Symptoms and Concerns.

Empty space: not applicable. For more detailed information regarding the definitions of psychometric properties and the 4-point scale rating, see the COSMIN website (www.cosmin.nl).

^aTest–retest reliability.

^bInter-rater reliability.

^cOnly the quality of the translation procedure was evaluated.