The Influence of Obesity on Patient Reported Outcomes following Total Knee Replacement

Table 2

Mean (std.) of the values of the outcome measures for the two BMI groups at 6 months and one year. P values of the group and time effect (before surgery, 6 months and one year).

Variable	Nonobese (𝑛=25)	Obese (𝑛=39)	P value (group)	P value (time)
OKS 6 months	28.7 (10.4)	27.4 (9.0)	0.620	<0.001
OKS 1 year	27.1 (11.0)	25.7 (9.0)	0.328
SF12 PCS 6 months	38.2 (10.4)	36.8 (10.5)	0.349	<0.001
SF12 PCS 1 year	41.1 (11.5)	36.6 (9.9)	0.310
SF12 MCS 6 months	52.3 (9.6)	52.6 (9.5)	0.289	0.436
SF12 MCS 1 year	53.4 (8.2)	52.2 (8.9)	0.820

PCS: physical component summary of the SF12, MCS: mental component summary of SF12.