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Relative risks, risk differences, and number needed to treat in reoperation rates comparing Goreisan users with nonusers.
| Relative risk | Risk difference | Number needed to treat | |
|---|---|---|---|
| (95% CI) | (95% CI) | (95% CI) | |
| Propensity-score matching (n = 7,758) | 0.78 (0.64; 0.93) | −1.4% (−2.4%; −0.38%) | 72 (41; 265) |
| Instrumental-variable analysis (n = 33,836) | — | −2.2% (−3.8%; −0.67%) | 45 (26; 148) |
CI, confidence interval.
