Table 1. Variables with data extracted.
| Variable | Details | No. (%) of studies with missing data, i.e., no reporting |
|---|---|---|
| Year of publication | 6 categories | 0 (0%) |
| Last author | 84 categories | 0 (0%) |
| Institution | 54 categories | 0 (0%) |
| Country | 12 categories | 0 (0%) |
| Mouse strain* | 14 categories | 0 (0%) |
| Mouse age | 4 categories | 2 (1.6%) |
| Mouse sex | 2 categories | 59 (56%) |
| Virus genotype | 3 categories | 0 (0%) |
| Virus strain* | 38 categories | 0 (0%) |
| Virus dose in PFU* | log10PFU continuous | 29 (22.8%) |
| Route of administration | 8 categories | 0 (0%) |
*The variable was a criteria for inclusion in the systematic review. For the purpose of meta-regression analysis, doses in tissue culture infective dose (TCID50) were converted to plaque forming units (PFU) and doses in lethal dose (LD) were excluded.