. Author manuscript; available in PMC: 2014 Sep 1.

Published in final edited form as: Evol Hum Behav. 2013 Jul 23;34(5):10.1016/j.evolhumbehav.2013.06.002. doi: 10.1016/j.evolhumbehav.2013.06.002

Table 3.

Beta values for separate mixed-effects regression models examining changes in testosterone while (A) tree chopping, and (B) resting

A	Model 1	Model 2	Model 3	Model 4	Model 5
Change in Log T	0.45^***	0.45^***	0.45^***	0.45^***	0.46^***
Time of Day	0.10	0.10	0.11	0.06	−0.80
BMI	−0.04	−0.05	−0.05	−0.04	−0.08^*
Age		0.002			0.005
Symptom: Pain			−0.07
Symptom: Illness				0.09
Avg. Heart Rate					−0.003
AIC	107.3	109.1	109.0	108.8	54.8¹

B	Model 1	Model 2	Model 3	Model 4
Change in Log T	−0.09	−0.09	−0.08	−0.09
Time of Day	0.58	0.42	0.12	0.35
BMI	−0.01	−0.01	−0.008	−0.002
Age		0.005	0.01^*	0.007
Symptom: Pain			−0.47^*
Symptom: Illness				−0.19
AIC	40.4	41.2	39.6	42.5

p<0.05

^**

p<0.01

^***

p<0.001

The sample size for model 5 is reduced because only 31 men had complete heart rate data.