Table 2.

Comparison of practice characteristics and bowel preparation recommendations of participating physicians by self-reported level of suboptimal bowel preparations (n=266; <10 %, n=217 and ≥10 %, n=49)

	Total		% Suboptimal preparations1				χ2	p value
			<10 %		≥10 %
	N	%	N	%	N	%
Practice characteristics
Region (n=266)							0.228	0.89
Northeast	86	32.3	69	80.2	17	19.8
South	94	35.3	78	83.0	16	17.0
West and Hawaii	86	32.3	70	81.4	16	18.6
Setting (n=263)							0.830	0.66
Urban	145	55.1	119	74.4	26	25.6
Suburban	100	38.0	80	80.0	20	20.0
Rural	18	6.8	16	88.9	2	11.1
Type of practice (n=264)							16.67	0.0002
Private	171	64.8	152	88.9	19	11.1
Hospital/University	81	30.7	55	67.9	26	32.1
Other	12	4.5	9	75.0	3	25.0
Teaching hospital affiliation (n=264)							6.953	0.008
No	99	37.5	89	77.0	10	10.1
Yes	165	62.5	127	89.9	38	23.0
No. colonoscopies per week (n=264)							2.868	0.41
≤10	27	10.2	21	77.8	6	22.2
11–20	87	33.0	68	78.2	19	21.8
21–30	93	35.2	81	87.1	12	12.9
>30	57	21.6	46	80.1	11	19.9
Patient insurance coverage (n=261)
Medicaid							9.541	0.002
≤25 %	237	90.8	199	84.0	38	16.0
>25 %	24	9.2	14	58.3	10	41.7
Medicare							5.779	0.0016
≤25 %	117	44.8	88	75.2	29	24.8
>25 %	144	55.2	125	86.8	19	13.2
Private insurance							4.552	0.033
≤25 %	57	21.8	41	71.9	16	28.1
>25 %	204	78.2	172	84.3	32	15.7
No insurance							0.118	0.73
≤25 %	257	96.3	210	81.7	47	18.3
>25 %	4	1.5	3	75.0	1	25.0
Bowel preparation recommendations
Dietary restrictionsb (n=265)							0.952	0.33
Liberal diet	76	28.7	65	85.5	11	14.5
Clear liquid only	189	71.3	152	80.4	37	19.6
Split dose (n=264)							7.714	0.006
No	107	40.5	79	73.8	28	26.2
Yes	157	59.5	137	87.3	20	12.7
Purgatives (n=264)
4 l PEG (no additives)							4.254	0.04
No	115	43.6	101	87.7	14	12.2
Yes	149	56.4	115	77.2	34	22.8
Sulfate-free PEG							4.991	0.03
No	174	65.9	149	85.6	25	14.4
Yes	90	34.1	67	74.4	23	25.6
Low volume PEG							0.898	0.34
No	167	63.3	140	83.8	27	16.2
Yes	97	36.7	76	78.4	21	21.6
Low volume PEG 3350							0.027	0.87
No	165	62.5	136	82.4	29	17.6
Yes	99	37.5	80	80.8	19	19.2
MoviPrep®							3.745	0.05
No	157	59.5	122	77.7	35	22.3
Yes	107	40.5	94	87.9	13	12.1

PEG=4 l polyethylene glycol without additives, Colyte^®, GoLYTELY^®; sulfate-free PEG = NuLYTELY^®, TriLyte^®; low volume PEG = HalfLytely^®; low volume PEG 3350 = MiraLAX^®; MoviPrep^® = PEG with ascorbic acid

^aSelf-reported proportion of suboptimal (fair, poor, or inadequate) bowel preparations per week

^bClear liquid only diet vs. liberal diet = clear liquid diet plus certain allowable food types