Table 2

Risk of bias rating, content validity rating and quality of measurement property rating of the 31 articles

PROM	Article	Content validity—PROM Development			Structural validity		Internal consistency		Reliability		Measurement error		Criterion validity		Hypotheses testing for construct validity			Responsiveness
		1by	Cty	RR	Structural validity		Internal consistency		Reliability		Measurement error		Criterion validity		9a	9b	Q	10a	10b	10c	10d	Q
		R	C	C	R	Q	R	Q	R	Q	R	Q	R	Q	R	R	Q	R	R	R	R	Q
RADAI	Salaffi CER 201059												V	+		V	+
	Salaffi CER 201258																			V	V	+
	Fransen A&R 200148												V	–		V	–	V			V	+
	Fransen Rheum 200049						API	API					V	–	V		–
	Uhlig ARD 200963								V	+	V	–
	Veehof ARD 200864				API	API	API	API					V	–						V	I	+
	Stucki A&R 199561						API	API							V		–
	Sullivan J Rheum 201062												V	–				V				–
	Houssien Rheum 199951												V	–	V		–
	Leeb J Rheum 200852						API	API
	Wolfe J Rheum 200565														V		–
	Katz 2018 ACR68																			V		–
RADAI-SF	Veehof ARD 200864				V	+	V	+					V	–						V	I	+
RADAI-SF	Stucki A&R 199561						V	+
RADAI5	Bossert JBSPIN 201145												V	–		V	+
	Leeb J Rheum 200852				D	?	V	?					V	–	V		?	V				–
	Leeb JBSPIN 200953				D	?	V	?					V	–
	Rintelen J Rheum 201357												V	–
PDAS2	Choy A&R 200847	D	–	+			API	API	D	+			V	+	V		–		V	V		–
PAS	Salaffi CER 201258																			V	V	+
PAS	Wolfe J Rheum 200565														V		–
PAS-II	Wolfe J Rheum 200565														V		–
RAPID3	Salaffi CER 201059												V	+		V	+
	Salaffi CER 201258																			V	V	+
	Pincus ACR 201154												V	+	V		+
	Pincus J Rheum 200855												V	–
	Castrejon J Clin Rheum 201346																				I	–
	Fujiwara Mod Rheum 201350												V	–
	Pincus ACR 201056												V	–
	Singh Clin Rheum 201260												V	+
	Boone 2015 SpringerPlus66												V	–
	Kim 2014 Rheum Int69												V	–	V		–
	Kumar 2017 Ind J Med Res70												V	–
	Walker 2017 Rheum74												V	–	V		–
	Yokogawa 2015 Mod Rheum75						API	API	I	?			V	–	V		–	V				–
	Uhlig ARD 200963								V	+	V	–
	Bossert JBSPIN 201145												V	–		V	+
	Leeb JBSPIN 200953				API	API	API	API					V	–
	Che 2016 Clin Exp Rheum67												V	–
	Munoz 2016 Clin Rheum71												V	+
	Qorolli 2017 Clin Rheum72												V	+	D		–
RAPID4	Pincus J Rheum 200855												V	–
RAPID4	Walker 2017 Rheum74												V	–	V		–
PRO-CLARA	Salaffi CER 201059	D	?	+	API	API	API	API					V	+	V	V	–
	Salaffi CER 201258																			V	V	+
	Salaffi 2015 Biomed Res Int73															V	+
GAS	Sullivan J Rheum 201062												V	–				V				–

Modified COSMIN. Only relevant columns shown so specific content validity columns, plus no cross-cultural validity/measurement invariance columns. Designed for risk of bias ratings but adapted to also show content validity ratings and quality of measurement property ratings.
1by: Cognitive interview study or other pilot test comprehensibility study.
9a: Convergent validity.
9b: Known groups validity.
10a: Comparison with gold standard.
10b: Comparison with other instruments.
10c: Comparison between subgroups.
±, inconsistent; +, sufficient; -, insufficient ; ?, indeterminate; A, adequate; API, analyses for these COSMIN domains are presented in these articles but have to be ignored; C, content validity rating; Cty, comprehensibility; D, doubtful; I, inadequate; N, N/A; PROMs, Patient Reported Outcome Measures; Q, quality of measurement property rating; R, risk of bias rating; RR, rating of reviewers; V, very good.