Table 2.

Compliance and satisfaction with bowel preparation according to age.

	Under 65 years of age (N = 118)			65 years of age and older (N = 61)
	OST group (n = 60)	PEG group (n = 58)	P value	OST group (n = 29)	PEG group (n = 32)	P value
Compliance (total taking dose)			.365			.614
50%–75%	3 (5.0)	1 (1.7)		0 (0.0)	0 (0.0)
75%–99%	1 (1.7)	0 (0)		1 (3.4)	3 (9.4)
100%	56 (93.3)	57 (98.3)		28 (96.6)	29 (90.6)
Compliance (total taking time)	Based on 14 tablets	Based on 1 L	<.001	Based on 14 tablets	Based on 1 L	.979
<30 min	20 (33.3)	3 (5.2)		4 (13.8)	3 (9.4)
30 min–1 h	26 (43.3)	33 (56.9)		16 (55.2)	13 (40.6)
1–2 h	9 (15.0)	8 (13.8)		5 (17.2)	10 (31.3)
2–3 h	4 (6.7)	13 (22.4)		4 (13.8)	5 (15.6)
3 h	1 (1.7)	1 (1.7)		0 (0.0)	1 (3.1)
Satisfaction*	8.1 ± 1.6	6.8 ± 2.5	.001	8.4 ± 2.6	6.4 ± 2.4	.003
Difficulty of eating			.002			.003
Ease	23 (38.3)	13 (22.8)		15 (51.7)	4 (12.5)
Relative ease	24 (40.0)	14 (24.6)		9 (31.0)	11 (34.4)
A little difficult	12 (20.0)	20 (35.1)		2 (6.9)	11 (34.4)
Quite difficult	1 (1.7)	10 (17.5)		3 (10.3)	6 (18.8)
Taste			<.001			<.001
Good	3 (5.0)	6 (10.3)		1 (3.4)	2 (6.3)
No taste	48 (80.0)	0 (0.0)		20 (69.0)	5 (15.6)
Not good, but edible	9 (15.0)	45 (77.6)		8 (27.6)	21 (65.6)
Bad	0 (0.0)	7 (12.1)		0 (0.0)	4 (12.5)
Total amounts of water intake			.648			.072
<500 mL	4 (6.6)	2 (3.6)		0 (0.0)	0 (0.0)
500–1000 mL	55 (91.7)	53 (96.4)		22 (75.9)	30 (93.8)
>1000 mL	1 (1.7)	0 (0.0)		7 (24.1)	2 (6.2)
Want to switch to another preparation on next colonoscopy	5 (8.5)	31 (54.4)	<.001	6 (20.7)	17 (53.1)	.016

Values are presented as mean ± standard deviation or n (%).

OST = oral sulfate tablet, PEG = polyethylene glycol.

^*Visual analog scale score (0–10 points, 0: very bad, 10: excellent).