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Primary outcome of butalbital prescription.
| Before matching | After matching | |||
|---|---|---|---|---|
| SMT | Non‐SMT | SMT | Non‐SMT | |
| Number of patients | 3118 | 141,039 | 3116 | 3116 |
| Butalbital, n | 54 | 8,232 | 54 | 118 |
| Butalbital, % (95% CI) | 1.7 (1.3–2.2) | 5.8 (5.7–6.0) | 1.7 (1.3–2.2) | 3.8 (3.1–4.5) |
| RR (95% CI) | 0.30 (0.23–0.39; p < 0.001) | (Reference) | 0.46 (0.33–0.63; p < 0.001) | (Reference) |
Abbreviations: 95% CI, 95% confidence intervals; RR, risk ratio; SMT, spinal manipulative therapy.
