Table 2 ‘Male participation’ GLMM testing the effect of strength in numbers and predictability of coalitionary support on participation likelihood (N = 342 encounters, 36 adult male subjects).

From: Group-level cooperation in chimpanzees is shaped by strong social ties

Term

Reference category

Estimate

SE

95% CI

Chisq

p

Intercept

 

−1.141

0.329

−1.733, −0.364

–

–

Test predictors

 Maternal kin (present)

Absent

1.177

0.455

0.387, 2.425

7.701

0.005

 Bond partner (present)

Absent

0.747

0.247

0.281, 1.321

9.092

0.0026

 Number femalesa

 

0.553

0.132

0.355, 0.822

11.504

0.001

 Number malesb

 

0.449

0.146

0.179, 0.747

5.134

0.023

Control predictors

      

 Dyadic associationc

 

0.485

0.147

0.243, 0.771

9.809

0.0017

 Number offspringd

 

−0.073

0.186

−0.407, 0.313

0.027

0.870

 Dominance ranke

 

0.205

0.144

−0.094, 0.470

1.575

0.210

 Agef

 

−0.272

0.335

−0.846, 0.264

0.361

0.548

 Agef—squared

 

0.093

0.199

−0.277, 0.481

0.068

0.795

 Type (vocal)

Contact

−0.124

0.193

−0.536, 0.241

0.405

0.525

 Food availabilityg

 

−0.002

0.095

−0.184, 0.185

0.001

0.986

 South group

East group

−0.203

0.417

−0.938, 0.559

2.511

0.285

 North group

East group

0.838

0.530

−0.130, 1.981

2.511

0.285

  1. In bold appear the 95% CIs that do not overlap 0.
  2. The coded levels are indicated in parenthesis.
  3. a–fz-transformed, mean ± SD of the original variables: a5.28 ± 3.53, b3.04 ± 1.29, c0.51 ± 0.18, d2.35 ± 2.38, e0.69 ± 0.26 (range 0–1 with 1 being the highest social rank), f21.31 ± 8.91, g1.81 ± 1.37.
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