Table 1.
Sensitivity Analyses. Meta-regression analyses of cumulative laying hen mortality in different commercially managed indoor housing systems as a function of mid-year of data collection using different meta-analytical models and subsets of the data.
| Analysis | Data sources | Housing | N (sources) | Beta | SE | p value |
|---|---|---|---|---|---|---|
| (1) Subset of data: variance provided by data sources | Excluded (lack of information on variance): ELS_06; FER_09; GER_12; FUL_19; NOR_18; AGR_14; TAH_14 | CC | 9 | − .0305 | .0569 | .609 |
| FC | 11 | − .0095 | .021 | .743 | ||
| ST | 11 | − .0878 | .0224 | .004 | ||
| MT | 7 | − .0909 | .0331 | .041 | ||
| AV | 23 | − .0767 | .0145 | .000 | ||
| (2) Results from the random effects model | All data sources in Table S2 | CC | 13 | − .0009 | .0081 | .905 |
| FC | 17 | − .0044 | .0053 | .4184 | ||
| ST | 14 | − .0225 | .0049 | .0006 | ||
| MT | 10 | − .0079 | .0072 | .3039 | ||
| AV | 30 | − .0132 | .0044 | .0060 |
Source codes are described in the Supplementary Table S2.
CC conventional cages, FC furnished cages, ST single-tier aviaries, MT multi-tier aviaries, AV indoor aviary (all types).