Validation and reliability of the Dutch version of the EORTC QLQ-NMIBC24 Questionnaire Module for patients with non-muscle-invasive bladder cancer

Journal of Patient-Reported Outcomes

Table 3 Item convergent and discriminant correlations by scale within the EORTC QLQ-NMIBC24 at each follow-up time point for 541 NMIBC patients participating in UroLife (multitrait scaling analysis and internal consistency)

Scale	T6wk (n = 541)			T3mo (n = 471)			T15mo (n = 423)
Scale	Con^a	Dis^b	α^c	Con^a	Dis^b	α ^c	Con ^a	Dis^b	α ^c
Urinary symptoms	0.53–0.82	− 0.21 to 0.26	0.85	0.51–0.82	− 0.18 to 0.31	0.86	0.45–0.84	− 0.11 to 0.27	0.82
Malaise	0.57–0.97	− 0.02 to 0.26	0.72	0.61–0.97	− 0.15 to 0.29	0.67	0.61–0.98	− 0.05 to 0.20	0.62
Future worries	0.82–0.89	− 0.06 to 0.25	0.90	0.83–0.87	− 0.07 to 0.26	0.89	0.83–0.88	0.00–0.26	0.90
Bloating and flatulence	0.74–0.89	− 0.07 to 0.22	0.59	0.71–0.89	− 0.05 to 0.27	0.57	0.66–0.90	− 0.13 to 0.23	0.51
Sexual functioning	0.91–0.94	− 0.21 to (− 0.02)	0.83	0.92–0.95	− 0.28 to (− 0.05)	0.86	0.91–0.95	− 0.19 to (− 0.04)	0.85
Male sexual problems	0.83–0.92	− 0.21 to 0.25	0.77	0.88–0.91	− 0.28 to 0.31	0.77	0.85–0.91	− 0.19 to 0.27	0.74