Table 1. Model-averaged coefficients of generalized linear mixed models for factors potentially affecting the likelihood of a female acting as an allonurser and the result of the best model.

Fixed effect	Estimate coefficient	SE	Z value	P	Relative variable importance
(A) Model averaging
Intercept	3.515	1.242	2.866	0.0016
Relatedness	1.579	0.625	2.491	0.0127	1.00
Reciprocity	6.963	1.650	4.175	0.00002	1.00
Age of offspring	−1.766	1.142	1.535	0.1246	0.90
Reproductive history	2.171	1.3157	1.637	0.1016	0.86
(B) Best model
Intercept	−3.7192	1.1413	−3.259	0.0011
Relatedness	1.6725	0.6164	2.718	0.0065
Reciprocity	7.2261	1.6407	4.404	0.0001
Age of offspring	−2.0913	0.9650	−2.167	0.0302
Reproductive history	2.4982	1.1539	2.165	0.0304