Table 4.

Study characteristics and rating of internal consistency.

Measurement instrument	Sample size	Results (Cronbach's α)	COSMIN Risk of Bias score2	Level of evidence3	Rating of results6
PedsQol18
1-12m	31	0.76 - 0.941	Very good	Low4	?7
13-24m	32	0.72 - 0.911	Very good	Low4	?7
2-18y	170	0.53 - 0.941	Very good	Moderate5	?7
CDLQI19
Proxy	135	0.83	Very good	High	?7
Self- report	28	0.87	Very good	Low4	?7

^1:Range of cronbachs's α: for each item, cronbach's α was measured separately.

^2:Based on the COSMIN risk of bias tool (Appendix 4).

^3:After application of the GRADE approach.

^4:Downgraded because of the sample size.

^5:Downgraded because of the indirectness, as the exact sample size of the size of the 5–18 years and < 5 years groups is not reported.

^6:Rating of results was either sufficient (+), insufficient (−) or indeterminate (?).

^7:Rated as indeterminate due to the absence of evidence for sufficient structural validity.