. Author manuscript; available in PMC: 2014 Jan 1.

Published in final edited form as: Value Health. 2012 Nov 30;16(1):97–103. doi: 10.1016/j.jval.2012.08.2207

Table 2.

Correlations between IBS-SSS Component Items, the Total IBS-SSS Score, and Results of a Factor Analysis on the Items

		Correlations
	Pain- Severity	Pain- Freq	Bloat	Bowel	Interfere	F1 Loading	F2 Loading	Unique Variance
Total	.76^*	.76^*	.66^*	.42^*	.57^*	-	-	-
Pain-Sev	1.00					.87	.17	.24
Pain-Frq	.45^*	1.00				.65	.45	.48
Bloating	.53^*	.29^*	1.00			.80	.02	.34
Bowel Dis	.00	.23^*	.02	1.00		.00	.85	.25
Interfer	.30^*	.25^*	.14	.35^*	1.00	.33	.75	.41

Notes: signifies a statistically significant correlation, p < 0.05; “Total” refers to the total score on the IBS-SSS scale; Factor loadings are standardized; Unique variances are standardized and reflect proportion of variance in a measure unaccounted for by the two factors: F1= Factor 1, F2 = Factor 2.