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. 2011 Dec 12;13(4):e109. doi: 10.2196/jmir.1593

Table 4.

Mean differences between measures

	Online questionnaire			Mail questionnaire			Difference	95% CI^a	t	df	P value
	Mean	SD	Cronbach alpha	Mean	SD	Cronbach alpha
PCS (SF-12v2)^b	54.13	7.2	.93	54.62	6.7	.66	–0.49	–1.36 to 0.38	–1.11	984	.27
MCS (SF-12v2)^c	46.04	9.67	.66	46.28	10.02	.67	–0.22	–1.45 to 1.0	–0.36	984	.72
FSI^d interference score	20.32	14.59	.93	18.04	14.45	.94	2.27	–0.39 to 0.54	2.45	970	.01
Anxiety	6.39	3.68	.80	6.31	3.72	.80	0.07	–0.105 to 0.66	0.31	968	.75
Depression	3.52	3.04	.76	3.24	3.05	.76	0.28	0.45 to 4.09	1.42	968	.16

^a Confidence interval.

^b Physical Component Score of the SF-12v2.

^c Mental Component Score of the SF-12v2.

^d Fatigue Symptom Inventory.