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Difference in Differences Analysis: Change in Average Weekly Hydroxychloroquine Prescriptions Before and After US Administration Endorsement
| Years | Mean pre-March 19 | 95% CI | Mean post-March 19 | 95% CI | Percent change | 95% CI | p value |
|---|---|---|---|---|---|---|---|
| 2019 | 251.7 | (241.5, 262.2) | 253.7 | (238.6, 269.9) | 0.80% | (− 6.4%, 8.6%) | 0.827 |
| 2020 | 292.9 | (281.9, 304.3) | 666.2 | (641.4, 692) | 127.5% | (115.6%, 140.1%) | < 0.001 |
| Difference in differences | 125.6% | (105.9%, 147.3%) | < 0.001 |
