Table 1.

Demographic and clinical characteristics of TJR patients with and without co-morbidity when placed on the waiting list. Independent Sample T-test or Chi-square test

Characteristics	Patients with co-morbidity	Patients without co-morbidity	P-value
	(n = 649–6621)	(n = 242–2441)
Age, years (mean ± SD)	67 ± 10	64 ± 11	0.000***
Females [n, (%)]	422(63)	132 (54)	0.008**
Marital status [n, (%)]
Married	411 (62)	160 (65)	0.155
Housing [n,%]
Living alone	227 (34)	62 (25)	0.008**
Basic education [n,%]
Low level	544 (82)	190(78)	0.130
Professional examination [n,%]
Low level	486 (75)	175 (73)	0.279
Employment status {n, (%)]
Retired	546 (82)	172(71)	0.000***
Health status [n, (%)]
Fair or poor	497 (75)	133 (55)	0.000***
VAS2 (mean ± SD)	62 ± 26	76 ± 24	0.000***
BMI3 (mean ± SD)	28.8 ± 4	27.2 ± 4	0.000***

¹Number of observation varies due to missing values; ²VAS, visual analog scale (100 the worst, 0 the best value); ³BMI, body mass index (wt/ht²); ** P < 0.01, ***P < 0.001