Dutch–Flemish translation and validation of the gastrointestinal symptom scales from the patient‑reported outcomes measurement information system (PROMIS)®

Journal of Patient-Reported Outcomes

Table 4 Confirmative factor analysis

DF-PROMIS gastrointestinal scales	CFI	RMSEA	TLI	SRMR
Reflux*	0.463	0.135	0.356	0.170
Disrupted swallowing	0.871	0.068	0.806	0.057
Diarrhea*	0.905	0.135	0.842	0.064
bowel incontinence	0.999	0.068	0.999	0.013
Constipation*	0.664	0.131	0.553	0.116
Belly pain*	0.998	0.030	0.967	0.020
Gas and bloating*	0.952	0.071	0.942	0.067

DF Dutch Flemish, PROMIS Patient-Reported outcomes measurement information system, CFI Comparative fit index, RMSEA root mean square error of approximation, TLI Tucker–Lewis index, SRMR standardized root mean square residual
*Distribution of response categories was highly skewed, and responses were merged. The complete overview of the merged categories is descripted in Appendix 2