Table 1: Mean (std.) of the demographics and number (%) of comorbidities for the two BMI groups and the total sample. P values of one-way ANOVA unless otherwise stated.

VariableTotal sample ( )Nonobese ( )Obese ( )

Age (yrs)66.7 (8.7)68.0 (8.8)65.7 (8.4)0.089
BMI (kg/m2)31.4 (5.6)26.6 (2.1)35.0 (4.7)<0.001
Female (%)¥105 (60.3)36 (48.0)69 (69.7)0.002
R.A (%)11 (6.3)5 (6.6)6 (6.1)0.24
OKS (pre) (12–60)43.3 (7.8)41.1 (8.0)44.7 (7.3)0.003
SF12 PCS (pre)29.0 (6.7)28.8 (6.2)30.0 (7.0)0.833
SF12 MCS (pre)49.4 (11.6)51.1 (10.6)48.3 (12.1)0.118
Diabetes Mellitus (%)¥23 (13.2)5 (6.6)18 (18.2)0.015
Hypertension (%)¥96 (55.2)34 (45.3)72 (72.7)<0.001
Respiratory dis. (%)33 (18.9)15 (20)18 (18.2)0.16
Cardiac disease (%)¥22 (12.6)8 (10.7)14 (14.1)0.15
Vascular disease (%)¥11 (6.3)4 (5.3)10 ( 10.1)0.12
Previous TKR (%)¥28 (16.1)14 (18.6)14 (14.1)0.12
Previous THR (%)¥22 (12.6)8 (10.6)14 (14.1)0.15

¥Fisher’s exact test, RA: rheumatoid arthritis, PCS: physical component summary of the SF12, and MCS: mental component summary of SF12.