Effect of music on colonoscopy performance: A propensity score-matched analysis

Table 1 Baseline characteristics of patients who did and did not listen to music before and after propensity score matching

	Before propensity score matching					After propensity score matching
	Total (n = 402)	Music (n = 200)	No music (n = 202)	P value	d	Total (n = 338)	Music (n = 169)	No music (n = 169)	P value	d
Age, yr	63.0 (54.0-70.0)	63.0 (54.5-69.0)	64.0 (54.0-70.0)	0.642	0.08	64.0 (55.0-70.0)	63.0 (53.0-69.0)	64.0 (56.0-70.0)	0.353	0.13
Female sex	190 (47.3%)	96 (48.0%)	94 (46.5%)	0.846	0.03	157 (46.4%)	83 (49.1%)	74 (43.8%)	0.383	0.11
BMI, kg/m2	23.7 (21.9-26.0)	23.7 (21.9-26.2)	23.7 (21.8-25.9)	0.992	0.00	23.7 (22.0-25.9)	24.0 (22.1-26.2)	23.6 (21.8-25.8)	0.383	0.09
ASA score				0.746	0.01				0.546	0.12
1	171 (42.5%)	86 (43.0%)	85 (42.1%)			152 (45.0%)	79 (46.7%)	73 (43.2%)
2	204 (50.7%)	100 (50.0%)	104 (51.5%)			167 (49.4%)	83 (49.1%)	84 (49.7%)
3	26 (6.5%)	14 (7.0%)	12 (5.9%)			18 (5.3%)	7 (4.1%)	11 (6.5%)
4	1 (0.2%)	0 (0.0%)	1 (0.5%)			1 (0.3%)	0 (0.0%)	1 (0.6%)
BBPS				0.768	0.04				0.684	0.06
3-5	87 (21.6%)	45 (22.5%)	42 (20.8%)			68 (20.1%)	32 (18.9%)	36 (21.3%)
6-9	315 (78.4%)	155 (77.5%)	160 (79.2%)			270 (79.9%)	137 (81.1%)	133 (78.7%)
Surgical history				0.041	0.07				0.060	0.02
None	259 (64.4%)	121 (60.5%)	138 (68.3%)			206 (60.9%)	98 (58.0%)	108 (63.9%)
Colon	99 (24.6%)	60 (30.0%)	39 (19.3%)			94 (27.8%)	56 (33.1%)	38 (22.5%)
Other abdominal organ	44 (10.9%)	19 (9.5%)	25 (12.4%)			38 (11.2%)	15 (8.9%)	23 (13.6%)
Indication for colonoscopy				0.002	0.32				1.000	0.00
Screening	207 (51.5%)	89 (44.5%)	118 (58.4%)			174 (51.5%)	87 (51.5%)	87 (51.5%)
Post operation surveillance	128 (31.8%)	66 (33.0%)	62 (30.7%)			120 (35.5%)	60 (35.5%)	60 (35.5%)
Patients with symptoms	67 (16.7%)	45 (22.5%)	22 (10.9%)			44 (13.0%)	22 (13.0%)	22 (13.0%)

Data are expressed as n (%), median (interquartile range). P values were calculated using Kruskal-Wallis test and χ² test. d: Standardized mean differences of propensity-matched population; BMI: Body mass index; ASA score: American Society of Anesthesiologists score; BBPS: Boston Bowel Preparation Scale.