Table 1.

Predictors of body mass (in grams) at sexual maturity (1 year). Results from GLMMs with litter and social group as random factors. Raw data are grouped into mean for clarity. For categorical fixed factors, parameter estimates show the estimated difference between the level in [brackets] and the level represented by the intercept. Non-significant interactions were dropped to allow significance testing of main terms, but models were not simplified further. To improve model convergence, pup weight and rainfall were standardized (std) by subtracting the mean and dividing by the standard deviation.

body mass (g) at maturity, at 1 year of age
fixed effects	β ± s.e.	${\mathit{\chi }}_{\mathbf{1}}^{\mathbf{2}}$	p-value
(intercept)	1102.57 ± 47.50
rainfall (std)	6.53 ± 12.04	0.304	0.581
body mass at emergence (std)	52.66 ± 11.75	18.90	1.378 × 10−5
escorting index	89.04 ± 33.53	6.846	0.0089
sex [male]	57.23 ± 18.58	9.439	0.0021
sex × escorting index	42.32 ± 64.97	0.434	0.510
number of observations	203 individuals, 82 litters, 11 packs