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Development of COVID-19 before and after PSM
| Variable | Development of COVID19 | Logistic regression analysis | P-value |
|---|---|---|---|
| OR (95% CI) | |||
| Before PSM | |||
| Control | 1567/20,289 (7.7) | 1 | |
| Metformin user | 480/7204 (6.7) | 0.85 (0.77, 0.95) | 0.003 |
| After PSM | |||
| Control | 541/5946 (9.1) | 1 | |
| Metformin user | 390/5946 (6.6) | 0.70 (0.61, 0.80) | < 0.001 |
PSM propensity score matching; OR odds ratio; CI confidence interval
