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Results of Elective Lumbar Spine Surgery Trend Regressed Against Key Macroeconomic Factors.
| Macroeconomic Factor | R 2 | P |
|---|---|---|
| National health expenditure | .0112 | .76 |
| Gross domestic product | .0011 | .92 |
| Standard & Poor’s (S&P) 500 Index | .37 | .05* |
*P ≤ .05.
