Table 2.
Number of times people injected drugs in last 30 days in San Francisco 2018–2020
| Period | Obs* | Median | Interquartile Range | Mean | SD | Adj IRR1 | 95% CI | p-value |
|---|---|---|---|---|---|---|---|---|
| July–December 2018 | 190 | 90 | (45 – 120) | 95.6 | 74.7 | Ref | - | - |
| January–June 2019 | 353 | 60 | (18 – 100) | 71.5 | 69.8 | 0.74 | (0.62, 0.87) | <0.01 |
| July–December 2019 | 297 | 25 | (4 – 90) | 49.4 | 63.3 | 0.53 | (0.39, 0.72) | <0.01 |
| January–June 2020 | 178 | 12.5 | (0 – 90) | 46.0 | 67.2 | 0.46 | (0.30, 0.72) | 0.01 |
*
Obs = number of observations; Includes baseline, 6-month, and 12-month observations. Data were missing for two observations (participant didn’t know)
1
Adj IRR = adjusted incident rate ratio; estimated using negative binomial GEE with unstructured correlation, adjusting for visit type (baseline, 6-month, 12-month), participant’s age, and currently enrolled in substance use treatment program. Ref= referent