Table 1.
Results of GAMM models for estimated lean body mass (ELBM) and activity budgets. The model was estimated controlling for sex (upper section), then respecified to determine whether smooth functions differed by sex (lower section). edf, estimated degrees of freedom.
| variable | ELBM | in trees | travel | feed | ripe fruit | rest | |
|---|---|---|---|---|---|---|---|
| global fit | adjusted R2 | 0.318 | 0.569 | 0.347 | 0.589 | 0.374 | 0.543 |
| SexM | estimate t p |
0.141 12.6 <0.0001 |
−0.424 −12.1 <0.0001 |
0.140 2.7 0.007 |
−0.061 −2.6 0.008 |
−0.086 −3.1 0.002 |
0.007 0.2 0.823 |
| age (smooth) | edf F p |
2.785 5.5 0.0006 |
1.004 11.1 0.0008 |
2.322 1.1 0.480 |
1.003 6.4 0.011 |
1.239 12.2 <0.0001 |
1.228 0.3 0.744 |
| diet (smooth) | edf F p |
3.280 6.3 0.0002 |
1.425 1.7 0.12 |
1.005 13.0 0.0003 |
1.746 9.6 <0.0001 |
2.099 56.6 <0.0001 |
2.821 4.3 0.008 |
| chimpanzee (random) | edf F p |
34.424 33.1 <0.0001 |
23.062 6.4 <0.0001 |
22.574 5.3 <0.0001 |
19.589 2.6 <0.0001 |
12.738 1.9 <0.0001 |
20.946 3.7 <0.0001 |
| study month (random) | edf F p |
219.499 33.1 <0.0001 |
57.831 2.2 <0.0001 |
68.411 2.5 <0.0001 |
75.787 4.7 <0.0001 |
34.944 1.5 <0.0001 |
71.838 3.8 <0.0001 |
| fits by sex | |||||||
| females (smooth) | edf F p |
1.000 4.8 0.028 |
1.001 4.1 0.044 |
2.666 1.9 0.134 |
1.005 2.7 0.100 |
1.011 5.4 0.019 |
1.075 0.1 0.885 |
| males (smooth) | edf F p |
2.981 6.2 0.0002 |
1.535 5.0 0.021 |
1.002 0.1 0.732 |
1.015 3.5 0.062 |
1.027 11.2 0.0008 |
1.005 0.2 0.670 |
| age × SexM (smooth) | edf F p |
4.172 4.3 0.0005 |
1.538 0.2 0.733 |
1.002 1.0 0.324 |
1.011 0.01 0.938 |
1.008 0.1 0.700 |
1.003 0.01 0.912 |