Table 2.

Estimates of factors influencing vigilance in free-ranging rhesus macaques based on output of Markov chain Monte Carlo general linear model

	Posterior mean	Lower 95% CI	Upper 95% CI
Intercept*	0.33	0.28	0.38
Sex (male)*	0.042	0.009	0.078
TPH2IP genotype (long)*	−0.052	−0.084	−0.022
5-HTTLPR genotype (short)	−0.004	−0.035	0.035
Age*	−0.0049	−0.0080	−0.0019
Group size	−0.000070	−0.0046	0.0032

Values indicate that the mean rate of vigilance during the movies was 33%. Males had an additional 4.2% increase in vigilance versus females, and long TPH2IP carriers had a 5.2% decrease in vigilance compared with short TPH2IP subjects. Age was inversely related to vigilance, with a decrease of 0.049% vigilance for each additional year.

An asterisk indicates those factors with 95% confidence intervals (CI) that did not overlap zero. Categorical factors in parentheses indicate the level used for comparison to baseline.