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. 2012 Apr 10;14(2):e50. doi: 10.2196/jmir.2005

Table 8.

Analysis of ratings and comments for high- and low-volume surgeons on first 20 websites (excluding bariatric surgery).

		Surgeon volumes						Analysis of variance
		All (N = 374)		Lumbar (n = 181)		Knee (n = 193)		Volume^a		Procedure^b		Interaction^c
		HV	LV	HV	LV	HV	LV	F1,370	P	F1,370	P	F1,370	P
Ratings
	Mean ratings/ website^d (SD)	6.76 (4.18)	5.47 (4.55)	7.70 (4.39)	6.08 (5.24)	5.85 (3.76)	4.93 (3.78)	8.21	.004	11.30	.001	0.62	.43
	Overall rating score^e (SD)	-0.01 (0.78)	0.02 (0.83)	-0.08 (0.80)	0.01 (0.85)	0.05 (0.76)	0.04 (0.81)	0.22	.64	0.96	.33	0.38	.54
Comments
		Surgeon volumes						Analysis of variance
		All (N = 266)^a		Lumbar (n = 138)		Knee (n = 128)		Volume^a		Procedure^b		Interaction^c
		HV	LV	HV	LV	HV	LV	F1,262	P	F1,262	P	F1,262	P
	Mean comments/ website^d (SD)	3.16 (2.36)	2.51 (2.32)	3.24 (2.24)	2.71 (2.60)	3.06 (2.51)	2.32 (2.03)	4.78	.03	0.98	.32	0.13	.72

^a Comparing high- versus low-volume surgeons

^b Comparing lumbar and knee surgeons

^c Comparing high- versus low-volume surgeons across surgeon categories

^d Only includes individual websites on which doctor had at least one rating/comment

^e z score