A comparative study of 21,194 UKAs and 49,270 HTOs for the risk of unanticipated events in mid-age patients from the national claims data in South Korea

Table 1 Patient baseline characteristics in 50–69 aged patients

	UKA	HTO	SMD
	(N = 21,194)	(N = 49,270)	SMD
Age (mean (sd))	60.41 (5.09)	57.84 (4.73)	0.523
Sex (%)			0.178
Female	17,365 (81.9)	37,845 (76.8)
Male	3829 (18.1)	11,425 (23.2)
Hypertension (%)	12,066 (56.9)	23,313 (47.3)	0.193
Hyperlipidemia (%)	12,101 (57.1)	26,843 (54.5)	0.053
Peripheral vascular disease(%)	6011 (28.4)	11,813 (24.0)	0.1
Diabetes_with out complication (%)	6352 (30.0)	12,246 (24.9)	0.115
Diabetes_with complication (%)	2582 (12.2)	4600 ( 9.3)	0.092
Osteoporosis (%)	7890 (37.2)	13,907 (28.2)	0.193
Depression (%)	3819 (18.0)	8335 (16.9)	0.029
Dementia (%)	392 ( 1.8)	611 ( 1.2)	0.049
Type of insurance (%)			0.004
Health insurance	20,504 (96.7)	47,697 (96.8)
Medical benefits	690 ( 3.3)	1573 ( 3.2)
City of residence (%)			0.163
Over 10milion	7452 (35.2)	13,967 (28.3)
Over 1milion	4787 (22.6)	13,780 (28.0)
Others	8955 (42.3)	21,523 (43.7)
Type of hospital (%)			0.122
Teaching hospital	2016 ( 9.5)	4940 (10.0)
General hospital	4625 (21.8)	8437 (17.1)
Independent hospital	13,809 (65.2)	33,774 (68.5)
Private clinic	744 ( 3.5)	2119 ( 4.3)
CCI (%)			0.11
0	1301 ( 6.1	3789 ( 7.7)
1	3072 (14.5)	8152 (16.5)
2	4284 (20.2)	10,731 (21.8)
≥ 3	12,537 (59.2)	26,598 (54.0)

UKA Unicompartmental knee arthroplasty, HTO High tibial osteotomy, SMD Standardised mean difference, CCI Charlson comorbidity index
^*CCI: Myocardial infarction, Congestive heart failure, Peripheral vascular disease, Cerebrovascular disease, Dementia, Chronic pulmonary disease, Connective tissue disease, Peptic ulcer disease, Mild liver disease, Moderate or severe liver disease (3), Diabetes without complications, Diabetes with complications (2), Paraplegia and hemiplegia (2), Renal disease (2), Cancer (2), Metastatic carcinoma (6), AIDS/HIV (6)

ISSN: 1471-2474