Table 5.

Ratings of the reported psychometric properties of validated instruments, based on the criteria of Terwee et al.³²

Instrument	First author, year	Content validity	Internal consistency	Criterion validity	Construct validity	Reproducibility (agreement)	Reproducibility (reliability)	Responsiveness	Floor and ceiling effects	Interpretability
SAHD	Rosenfeld, 199921	+	+	+	+	0	0	0	+	0
SAHD	Rosenfeld, 200024	+	+	−	?	0	0	0	+	0
Modified DDRS	Kelly, 20021	+	+	0	0	0	0	0	0	0
SAHD	Mystakidou, 200425	+	+	0	0	+	+	0	+	0
SISC	Wilson, 200433	+	0	+	?	?	−	0	0	0
SAHD	Shim, 201113	+	−	0	0	0	0	0	0	0
SAHD	Villavicencio-Chávez, 201415	+	+	0	+	0	0	0	0	0
SAHD	Galushko, 201526	+	+	−	?	0	0	0	0	0

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

Rating: +: positive (the study by Terwee et al.⁶⁰ specifies criteria for determining whether the quality of each measurement property can be regarded as positive or negative); ?: indeterminate (doubtful information regarding each psychometric property); −: negative; 0: no information available. For more detailed information regarding the quality criteria for measurement properties of health status questionnaires, see Terwee et al.³² (Table 1, p. 39).