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Pearson's correlation coefficients between BMI and the outcome measures before surgery, at 6 months and 1 year after surgery and between BMI and the change scores.
| OKS | SF12 (PCS) | SF12 (MCS) | |
|---|---|---|---|
| Pre-op. | 0.271* | −0.086 | −0.101 |
| 6 months | 0.115 | 0.143 | −0.139 |
| 1 year | 0.072 | −0.206 | −0.041 |
| Pre-6m | −0.082 | −0.117 | −0.015 |
| Pre-1yr | −0.194 | −0.159 | −0.068 |
*P < 0.01, PCS: physical component summary of the SF12, and MCS: mental component summary of SF12.
