Table 4.

Convergent validity testing: Spearman's rank correlation coefficients between scales from QOL-PCD and generic HRQOL measures (SNOT-20, SGRQ-C and SF-36)

	SNOT-20	SGRQ-C				SF-36
Scales of QOL-PCD		Total	Symptoms	Activity	Impacts	Physical functioning	Rolephysical	Bodily pain	General health	Vitality	Social functioning	Role functioning	Mental health	Total physical score	Total mental score
Physical	0.51	−0.83	−0.78	−0.85	−0.74	0.83	0.79	0.54	0.79	0.65	0.62	0.49	0.46	0.84	0.37
Emotional	−0.48	−0.52	−0.04	−0.47	−0.54	0.47	0.55	0.60	0.63	0.61	0.67	0.60	0.73	0.57	0.69
Treatment	−0.61	−0.67	−0.61	−0.54	−0.65	0.54	0.67	0.78	0.66	0.54	0.50	0.54	0.38	0.71	0.36
Social	−0.21	−0.43	−0.40	−0.28	−0.48	0.34	0.35	0.32	0.42	0.46	0.28	0.27	0.34	0.39	0.27
Role	−0.60	−0.80	−0.73	−0.67	−0.78	0.73	0.84	0.68	0.79	0.69	0.72	0.44	0.47	0.86	0.43
Health	−0.64	−0.84	−0.76	−0.72	−0.84	0.71	0.79	0.76	0.87	0.79	0.76	0.50	0.62	0.87	0.56
Vitality	−0.46	−0.63	−0.67	−0.49	−0.59	0.59	0.56	0.60	0.72	0.75	0.52	0.43	0.39	0.69	0.43
Upper respiratory	−0.60	−0.39	−0.31	−0.31	−0.39	0.36	0.51	0.54	0.48	0.35	0.42	0.37	0.39	0.48	0.35
Lower respiratory	−0.53	−0.72	−0.69	−0.61	−0.69	0.59	0.69	0.58	0.75	0.67	0.59	0.43	0.49	0.69	0.49
Ear and hearing	−0.57	−0.47	−0.40	−0.36	−0.49	0.51	0.49	0.46	0.66	0.55	0.51	0.39	0.46	0.56	0.47

We a priori hypothesised scales that would have stronger correlations (closer to 1 or −1); these correlations are shadowed grey.

HRQOL, health-related quality of life;

PCD, primary ciliary dyskinesia; QOL, quality of life; SF-36, Medical Outcome Survey Short Form-36 (higher score indicates better health status); SGRQ-C, St George Respiratory Questionnaire (higher score indicates worse HRQOL).