Table 2.

Demographic data of LKOAC in baseline

	Before PSM					After PSM
Variables	Control		Exposure	Z/P		Control		Exposure	Z/P
	n = 127		n = 431			n = 117		n = 117
Age	62(56 ~ 70)		63(57 ~ 70)	0.2/0.83		61(55 ~ 70)		62(54 ~ 70)	0.2/0.87
BMI	29.3(26.4 ~ 32.7)		30.3(27.2 ~ 33.9)	1.8/0.07		29.3(26.4 ~ 32.7)		28.9(26.4 ~ 32.2)	0.4/0.65
LWOMAC	5(0 ~ 19.8)		10(1 ~ 28)	2.1/<0.05		5(0 ~ 23.5)		9(1 ~ 24)	1.1/0.26
LJSW	4(3.2 ~ 4.7)		3.9(2.9 ~ 4.8)	0.8 < 0.05		3.9(3.1 ~ 4.7)		3.9(2.9 ~ 4.9)	0.3/0.76
SF-12	41(39 ~ 43)		41(39 ~ 43)	1.1/0.27		41(39 ~ 43)		41(39 ~ 42)	1.1/0.27
Sex				1.4/0.15					0.3/0.79
male	48(37.8%)		194(45%)			46(39.3%)		44(37.6%)
female	79(62.2%)		237(55%)			71(60.7%)		73(62.4%)
Race				3.0/<0.05					0.4/0.68
others	0		6(1.4%)			0		1(0.9%)
white	112(88.2%)		314(72.8%)			102(87.2%)		98(83.7%)
black	15(11.8%)		109(25.3%)			15(12.8%)		17(14.5%)
yellow	0		2(0.5%)			0		1(0.9%)
CCI				0.7/0.49					1.1/0.27
0	94(74%)		305(70.8%)			87(74.3%)		79(67.5%)
1	22(17.3%)		84(19.5%)			20(17.1%)		26(22.2%)
2	8(6.3%)		34(7.9%)			8(6.8%)		10(8.5%)
3	1(0.8%)		5(1.2%)			1(0.9%)		1(0.9%)
> 3	2(1.6%)		3(0.7%)			1(0.9%)		1(0.9%)
Income(5 W)				0.3/0.76					0.7/0.51
Y	73(57.5%)		241(55.9%)			69(59%)		64(54.7%)
N	54(42.5%)		190(44.1%)			48(41%)		53(45.3%)
L-KLG				2.0/<0.05					0.4/0.69
2	85(66.9%)		245(56.8%)			75(64.1%)		73(62.4%)
3	35(27.6%)		154(35.7%)			35(29.9%)		34(29.1%)
4	7(5.5%)		32(7.4%)			7(6%)		10(8.5%)
Medicine				2.2/<0.05					0.5/0.6
Y	52(40.9%)		225(52.2%)			51(43.6%)		47(40.2%)
N	75(59.1%)		206(47.8%)			66(56.4%)		70(59.8%)

There is no significant difference of all variables between two groups after PSM