Table 3.

Comparison of the per capita received aggression of focal helpers in the prevented help treatment. Reference categories for estimates of factors ‘larger helper’ and ‘similar helpers’: breeder; and of factor ‘group size’: large groups. n = 20 groups; p-values of less than 0.05 are highlighted in bold, and 0.05 < p < 0.1 are italicized.

factors	estimate ± s.e.	z-value	p-value
per capita received aggression
larger helper	−0.421 ± 0.906	−0.47	0.64
similar helper	1.433 ± 1.022	1.40	0.16
group size	0.879 ± 0.957	0.92	0.36
larger helper × group size	−2.718 ± 1.571	−1.730	0.084
similar helper × group size	−4.572 ± 1.641	−2.79	0.005