Table 1.

Air vs. water method - mean pain scores

Study	Method	Number of patients	Rectum	Sigmoid	Descending colon	Transverse colon	Ascending colon	Cecum
1	Air	28	0	1	2	4	4	2
	Water	28	1	1	2	3*	1*	1
2	Air	31	1	3	4	4	5	2
	Water	31	0	1	2	3*	3*	2
3	Air	50	0	1	2	3	3	2
	Water	50	0	1	1	2*	2*	1

Data are mean pain scores. Pain score: 0 = none, 10 most severe.

^*vs. respective air method, p < 0.05, Student t test.

Study 1: Minimal sedation - Attending (5/08–7/08); Study 2: Minimal sedation - Trainees (11/08–2/09); Study 3: On demand sedation - Attending 4/09–11/09.