Table 3: Mean (std.) of the change score data for the three BMI groups, means, and standard deviations.

Outcome Nonobese () Obese () P value OKS (pre-6mo) −11.5 (10.9) −15.3 (8.8) 0.129 OKS (pre-1yr) −13.2 (9.9) −17.0 (9.1) 0.120 SF12 PCS (pre-6mo) 8.4 (13.2) 6.9 (10.6) 0.603 SF12 PCS (pre-1yr) 11.3 (11.9) 6.7 (7.9) 0.061 SF12 MCS (pre-6mo) 0.5 (11.8) 3.1 (12.3) 0.233 SF12 MCS (pre-1yr) 0.7 (9.3) 2.7 (10.8) 0.428

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