Readmission rate and early complications in patients undergoing total knee arthroplasty: A retrospective study

Table 1 Characteristics of the study population

Study variable		Cases, n	Percent, %
Age in year	≤ 40	5	0.8
	41-50	43	7.1
	51-60	197	32.3
	61-70	251	41.2
	71-80	104	17.1
	> 80	9	1.5
Sex	Female	420	69
	Male	189	31
Body mass index in kg/m2	< 24.9 (normal)	249	40.8
	25-29.9 (overweight)	332	54.5
	> 30 (class 1 obesity)	28	4.6
Diagnosis	Osteoarthritis	593	97.4
	Rheumatoid arthritis	16	2.6
Laterality	Bilateral	304	49.9
	Unilateral	305	50.1
Duration of complaint	< 1	3	0.5
	1-2.0	26	4.3
	2-5.0	168	27.6
	5-10.0	239	39.2
	> 10	173	28.4
Charlson comorbidity index	< 2	399	65.5
	2-3.0	156	25.6
	> 4	54	8.9
Length of stay in day	6	297	48.8
	7	306	50.2
	8	4	0.7
	10	1	0.2
	13	1	0.2