Table 2.

Baseline health-related quality of life scores and reliability assessments

	N	Number of items	Range	Mean (SD)	%Floor	%Ceiling	Internal consistency reliability*	Test-retest reliability**
Chronic sinusitis survey (0–100 scale)
Sinus symptoms	63	3	0–100	40 (26)	13	2	0.55	0.92
Medication usage	62	3	17–100	83 (18)	0	32	0.31	0.87
Total	61	6	29–92	62 (16)	0	0	0.39	0.94
SF-36 (0–100 scale)
Physical functioning	63	10	10–100	82 (20)	0	16	0.91	0.93
Role – physical	64	4	0–100	54 (41)	25	33	0.83	0.86
Bodily pain	64	2	0–100	60 (23)	2	13	0.86	0.88
General health	64	5	15–100	59 (23)	2	2	0.76	0.94
Vitality	64	4	0–85	47 (23)	5	0	0.87	0.90
Social functioning	64	2	13–100	69 (26)	0	23	0.81	0.84
Role – emotional	62	3	0–100	66 (38)	16	45	0.72	0.76
Mental health	64	5	16–100	74 (17)	0	2	0.82	0.89
Physical component summary***	61	35	21–61	44 (9)	-	-	-	0.94
Mental component summary***	61	35	23–59	46 (11)	-	-	-	0.90

%Floor = percentage of patients scoring lowest possible value, %Ceiling = percentage of patients scoring highest possible value.

* Cronbach's alpha, ** Intraclass correlation coefficient, N = 38–41, *** Standardized for comparison with an American general population with mean 50, SD 10.