Table 3.
The variable categories, measurement types, mean, standard deviation (SD), median, and inter-quartile range (IQR) used for the set of model covariates.
| Variable Category (database) | Variable | Measure | Mean | SD | Median | 25th Percentile | 75th Percentile |
|---|---|---|---|---|---|---|---|
| Ground personnel resource use (ROSS/iROC) | Ground personnel used per fire day | Continuous | 190.2 | 478.6 | 56 | 18 | 153 |
| Ground personnel used per fire day (log) | Continuous (log) | 3.9 | 1.8 | 4.03 | 2.9 | 5.0 | |
| Incident overview (ICS-209) | During-COVID Threshold | Binary | 0.5 | 0.5 | 0 | 0 | 1 |
| Human-caused | Binary | 0.1 | 0.3 | 0 | 0 | 0 | |
| Year | Factor | ||||||
| Fire characteristics (ICS-209) | New fires in GACC | Continuous | 16.4 | 15 | 13 | 7 | 22 |
| Complexity Type 1 | Binary | 0.2 | 0.4 | 0 | 0 | 0 | |
| Complexity Type 2 | Binary | 0.3 | 0.4 | 0 | 0 | 1 | |
| Complexity Type 3 | Binary | 0.5 | 0.5 | 0 | 0 | 1 | |
| Current fire size (ha) | Continuous | 33,395 | 81,797 | 5,444 | 956 | 26,354 | |
| Current fire size (ha) | Continuous (log) | 8.5 | 2.3 | 8.6 | 6.9 | 10.2 | |
| Percent incident contained | Continuous | 46.5 | 36 | 0.01 | 10 | 45 | |
| Fire behavior: minimal | Binary | 0.5 | 0.5 | 0 | 1 | 1 | |
| Fire behavior: moderate | Binary | 0.2 | 0.4 | 0 | 0 | 0 | |
| Fire behavior: active | Binary | 0.2 | 0.4 | 0 | 0 | 0 | |
| Fire behavior: extreme | Binary | 0.1 | 0.2 | 0 | 0 | 0 | |
| Weather conditions (GridMet) | Energy release component (percentile) | Continuous | 0.8 | 0.2 | 0.9 | 0.8 | 0.9 |
| Daily accumulated precipitation (mm) | Continuous | 0.6 | 2.9 | 0 | 0 | 0 | |
| Vapor-pressure deficit (kPa) | Continuous | 1.7 | 0.8 | 1.58 | 1.1 | 2.2 | |
| Societal risk factors (ICS-209) | Evacuations in progress or planned | Binary | 0.04 | 0.2 | 0 | 0 | 0 |
| Area closure | Binary | 0.01 | 0.1 | 0 | 0 | 0 | |
| Structures threatened* | Continuous | 405 | 3224 | 0.03 | 0.03 | 0.03 | |
| Public injuries and fatalities | Continuous | 2.1 | 5.8 | 0 | 0 | 0 | |
| Responder injuries and fatalities | Continuous | 0.1 | 0.9 | 0 | 0 | 0 | |
| Strategic objectives (ICS-209) | Historical, cultural concerns | Binary | 0.2 | 0.4 | 0 | 0 | 0 |
| Public land ecological concerns | Binary | 0.02 | 0.1 | 0 | 0 | 0 | |
| Social considerations | Binary | 0.2 | 0.4 | 0 | 0 | 0 | |
| Economic considerations | Binary | 0.1 | 0.3 | 0 | 0 | 0 | |
| Personnel health and safety concerns | Binary | 0.1 | 0.3 | 0 | 0 | 0 | |
| Public health and safety concerns | Binary | 0.2 | 0.4 | 0 | 0 | 0 | |
| Preparedness Levels (ISMR Reports) | PL 1 or 2 | Binary | 0.2 | 0.4 | 0 | 0 | 0 |
| PL 4 or 5 | Binary | 0.5 | 0.5 | 0 | 0 | 1 | |
| Daily COVID-19 caseloads (CDC) | New daily COVID-19 cases per state ** | Continuous | 2,077 | 3613 | 637 | 262 | 2712 |
Data sources are listed in parentheses below the variable category, and more information on each datasource can be found online in Fig. S12.
*Including residential, commercial, and other structure types; ** Only used COVID-19 caseloads in models that assessed 2020 versus 20.