Total knee arthroplasty: Effect of obesity and other patients’ characteristics on operative duration and outcome

Table 3 Association of patients’ characteristics and length of hospital stay

Length of hospital stay vs		Unilateral TKR					Bilateral TKR
		n	%	Mean	SD	P value	n	%	Mean	SD	P value
Gender	Males	35	21.5	12.6	6.3	0.37	14	34.1	14.6	4.1	0.79
	Females	128	78.5	10.9	3.7		27	65.9	15	6.1
BMI	Normal BMI	5	3.1	10.8	2.5	0.27	4	9.8	12	2.2	0.32
	(BMI value 18.5 to < 25)
	Overweight	27	16.6	10.7	3.6		10	24.4	14.7	6.9
	(BMI value 25 to < 30)
	Obesity class 1	40	24.5	12.6	6.8		7	17.1	16.6	5.6
	(BMI value 30 to < 35)
	Obesity class 2	48	29.4	10.7	3.3		13	31.7	13.5	4.1
	(BMI value 35 to < 40)
	Morbid obesity	43	26.4	10.9	3.3		7	17.1	17.9	6.1
	(BMI value > 40)

TKR: Total knee replacement; BMI: Body mass index.