Table 1.

Univariate analysis of MR+ and MR- groups

							95% Confidence interval
Parameter		n	MR+ (n=29)	MR- (n=1625)	P-value	Odds ratio	Lower	Upper
Sex	Female	1464	25 (1.7%)	1439 (98.3%)	0.567	0.808	0.275	3.229
	Male	190	4 (2.1%)	186 (97.9%)
Age (years)	≥80	70	2 (2.9%)	68 (97.1%)	0.350	1.695	0.192	6.987
	<80	1584	27 (1.7%)	1557 (98.3%)
BMI (kg/m2)	≥30	93	3 (3.2%)	90 (96.8%)	0.221	1.967	0.374	6.605
	<30	1561	26 (1.7%)	1535 (98.3%)
Antibiotic use within 3 years	+	337	8 (2.4%)	329 (97.6%)	0.351	1.500	0.569	3.565
	-	1317	21 (1.6%)	1296 (98.4%)
Corticosteroid use	+	36	2 (5.6%)	34 (94.4%)	0.130	3.461	0.384	14.752
	-	1618	27 (1.7%)	1591 (98.3%)
Albumin (g/dL)	<3.5	18	1 (5.6 %)	17 (94.4 %)	0.274	3.374	0.078	23.091
	≥3.5	1636	28 (1.7 %)	1608 (98.3 %)
GFR (mL/min)	<50	108	3 (2.8%)	105 (97.2%)	0.432	1.670	0.318	5.586
	≥50	1546	26 (1.7%)	1520 (98.3%)
Brain disease	+	54	0 (0.0%)	54 (100.0%)	1.000	0.000	0.000	4.078
	-	1600	29 (1.8%)	1571 (98.2%)
Thyroid disease	+	29	1 (3.4%)	28 (96.6%)	0.404	2.036	0.048	13.262
	-	1625	28 (1.7%)	1597 (98.3%)
Cardiac disease	+	21	0 (0.0%)	21 (100.0%)	1.000	0.000	0.000	11.254
	-	1633	29 (1.8%)	1604 (98.2%)
Pulmonary disease	+	20	0 (0.0%)	20 (100.0%)	1.000	0.000	0.000	11.873
	-	1634	29 (1.8%)	1605 (98.2%)
Diabetes	+	109	1 (0.9%)	108 (99.1%)	1.000	0.502	0.012	3.097
	-	1545	28 (1.8%)	1517 (98.2%)
Asthma	+	55	2 (3.6%)	53 (96.4%)	0.251	2.196	0.247	9.130
	-	1599	27 (1.7%)	1572 (98.3%)
Smoking	+	76	1 (1.3%)	75 (98.7%)	1.000	0.738	0.018	4.594
	-	1578	28 (1.8%)	1550 (98.2%)
Revision surgery	+	155	2 (1.3%)	153 (98.7%)	1.000	0.713	0.081	2.883
	-	1499	27 (1.8%)	1472 (98.2%)

BMI Body mass index, GFR Glomerular filtration rate. * P<0.05Values are shown as the number of patients (%). Fisher's exact test