Table 4.

Results from the STEP model with covariates. Reported effects are adjusted for effects of all other covariates.

Variable (unit)	Summary Score Parameter Estimate (SE)	Communication Parameter Estimate (SE)	Traffic Avoidance Parameter Estimate (SE)	Emergency Parameter Estimate (SE)	Approach Parameter Estimate (SE)
Intercept (mean, I)	.324 (.258) (p = .210)	.476 (.373) (p = .201)	.412 (.336) (p = .220)	−.153 (.505) (p = .762)	.554 (.392) (p = .158)
Interval (day)	−.002 (.001) (p < .001)	−.003 (.001) (p < .001)	−.001 (.001) (p =.671)	−.002 (.001) (p = .167)	−.004 (.001) (p = .001)
Practice (event)	.074 (.007) (p < .001)	.092 (.009) (p < .001)	.053 (.014) (p < .001)	.119 (.014) (p < .001)	.030 (.013) (p = .024)
Age (year)	−.015 (.004) (p < .001)	−.022 (.006) (p < .001)	−.012 (.006) (p = .036)	−.011 (.008) (p = .190)	−.016 (.006) (p = .015)
Expertise (level)	.206 (.038) (p < .001)	.273 (.055) (p < .001)	.123 (.050) (p = .013)	.244 (.075) (p = .001)	.181 (.058) (p = .002)
Cognitive processing speed (sd)	.338 (.048) (p < .001)	.447 (.070) (p < .001)	.234 (.063) (p < .001)	.358 (.094) (p < .001)	.314 (.073) (p < .001)
Executive function (sd)	.064 (.029) (p = .029)	.083 (.042) (p = .049)	.028 (.038) (p = . 465)	.083 (.057) (p = .147)	.061 (.044) (p = .168)
IIV (sd)	−.162 (.036) (p < .001)	−.247 (.053) (p < .001)	−.118 (.047) (p = .013)	−.181 (.071) (p = .011)	−.102 (.055) (p = .066)