Table 1.
Heterogeneity in strain, group-size, and littermates for studies meeting pre-specified criteria.
| Study | Strain | Supplier | Group-size (# mice per cage) |
|---|---|---|---|
| Bartolomucci et al. (2001) | Swiss CD-1∧ | Charles River, Italy | 3 |
| Bartolomucci et al. (2004) | Swiss CD-1 | Charles River, Italy | 3 |
| Colas-Zelin et al. (2012) | CD-1 | Harlan Sprague Dawley Inc., Indianapolis, IN | 3 |
| Ferrari et al. (1998) | Swiss-Webster | Banting & Kingman, UK | 5 to 6 |
| Fitchett et al. (2005a) | CD-1 | Harlan, UK | 2 |
| Fitchett et al. (2009) | CD-1 | Harlan, UK | 2 |
| Hilakivi et al. (1989) | NIH Swiss | – | 4 to 5 |
| Hilakivi-Clarke and Lister (1992) | NIH Swiss | – | 5 |
| Horii et al. (2017) | C57BL/6NCrSlc | Japan SLC Inc., Shizuoka | 4 |
| Kunkel and Wang (2018) | C57BL/6 | – | 3 to 5* |
| Larrieu et al. (2017) | C57BL/6J | Charles River | 4 |
| Palanza et al. (2001) | Swiss CD-1∧ | Charles River, Italy | 3* |
| Pallé et al. (2019) | C57BL/6J | Envigo, UK | 4 |
| Saldívar-González et al. (2007) | BALB/cJ∧ | – | 3 and 9 |
| Sá-Rocha et al. (2006) | C57BL/6 | – | 2 |
| Varholick et al. (2018) | C57BL/6ByJ | Charles River, France | 4 to 5 |
| Varholick et al. (2019) | RjOrl:SWISS | Janvier Labs, France | 3 |
| Vekovishcheva and Sukhotina (2000) | White Outbred | Rappolovo, Russia | 3 |
| Wang et al. (2011) | C57BL/6 | – | 4 |
| Zhou et al. (2017) | C57BL/6J | Shanghai laboratory animal center | 4 |
∧
denotes mice bred in house;
*
denotes litter-mates, – denotes information not available. For the “group-size” column the conjunction “and” denotes that both group sizes were studied, where the conjunction “to” denotes that range of group sizes that were studied but not systematically varied.