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. Author manuscript; available in PMC: 2014 Aug 21.
Published in final edited form as: JAMA Pediatr. 2014 Jun;168(6):517–522. doi: 10.1001/jamapediatrics.2013.5387

Table.

Mixed-Effect Poisson Models for Crashes and Near Crashes and Cortisol Response

Main Effect Model Interaction Model
Variable exp(β) (95% CI) P Value exp(β) (95% CI) P Value
Intercept 0.71 (0.46–1.08) .11 0.81 (0.53–1.24) .34
Time since licensure (3-mo clusters) 0.92 (0.82–1.02) .12 0.88 (0.78–0.98) .03
AUCI 0.93 (0.88–0.98) .007
Time × AUCI 0.98 (0.96–0.99) .002
AIC 633.0 630.7

Abbreviations: AIC, Akaike information criterion; AUCI, area under the curve as a function of increase for cortisol; exp(β), exponential of the regression coefficient.