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).

VariableNonobese ( )Obese ( )P value (group)P value (time)

OKS 6 months28.7 (10.4)27.4 (9.0)0.620<0.001
OKS 1 year27.1 (11.0)25.7 (9.0)0.328
SF12 PCS 6 months38.2 (10.4)36.8 (10.5)0.349<0.001
SF12 PCS 1 year41.1 (11.5)36.6 (9.9)0.310
SF12 MCS 6 months52.3 (9.6)52.6 (9.5)0.2890.436
SF12 MCS 1 year53.4 (8.2)52.2 (8.9)0.820

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