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| Month | Indoor HLC densities | Outdoor HLC densities | Weighted proportion indoors | Weighted proportion outdoor | Indoor/outdoor ratio | p value (compared to July) |
|---|---|---|---|---|---|---|
| July | 223 | 227 | 57.45 | 42.55 | 1.35 | |
| August | 226 | 322 | 94.20 | 5.80 | 16.25 | <0.01 |
| September | 1230 | 1255 | 96.79 | 3.21 | 30.17 | <0.01 |
| October | 271 | 334 | 90.85 | 9.15 | 9.93 | <0.01 |
| November | 167 | 211 | 98.05 | 1.95 | 50.33 | <0.01 |
| December | 81 | 59 | 82.85 | 17.15 | 4.83 | 0.02 |
* No vectors were captured by HLC in June
