Table 5. Data from 298 colon total scores from this study (149 by the gastroenterologists and 149 by the physician's assistant) and 591 colon total scores from a previous study⁷ where all colon segments were visualized.

	Ottawa BPS total scores
	0	1	2	3	4	5	6	7	8	9	10	11	12	13	14
Number Ottawa BPS total scores (n=298)	7	17	15	32	34	43	50	35	34	20	9	1	1
Number of inadequate scores (n=6 of 298)									2	1	1	1	1
Number Ottawa BPS total scores (n=591)	122	114	106	67	47	41	41	22	14	10	4	1	1		1
Number of inadequate scores (n=27 of 591)				1		2	3	4	5	6	3	1	1		1
Boston BPS total score 9 (n=194 of 591)	7	17	15	29	26	29	30	21	11	5	4
Boston BPS total score 8 (n=39 of 591)				2	6	9	6	4	9	2	1
Boston BPS total score 7 (n=25 of 591)					2	2	7	4	5	4	1

	Boston BPS total scores
	9	8	7	6	5	4	3	2	1	0
Number Boston BPS total scores (n=298)	194	39	25	23	9	5	2	1
Number of inadequate scores (n=6 of 298)						3	2	1
Number Boston BPS total scores (N=591)	305	120	70	63	17	8	4	2	1	1
Number of inadequate scores (n=27 of 591)			1	1	10	7	4	2	1	1

	Chicago BPS total scores
	36	35	34	33	32	31	30	29	27	26	25	20	15	10
Number Chicago BPS total scores (n=298)	100	66	43	20	20	4	19	4	4	1	9	5	2	1
Number modified Chicago BPS total scores (n=298)				194	40	19	19	0	4	5	9	5	2	1
Number of inadequate scores (n=6 of 298)											3	2	1
Boston BPS total score 9 (n=194 of 298)	100	66	24	4
Boston BPS total score 8 (n=39 of 298)			19	15	5
Boston BPS total score 7 (n=25 of 298)				1	15	4		4			1

BPS, bowel preparation scale.

The Chicago BPS vs. Boston BPS data are from this study only.