Table 3.

Linear mixed-effects regression model for transport time.

Variable	Variance components estimate (minutes)	P-value
Fixed effects
Base point (Intercept)	22.0
Age type
Adult	−0.4 (−1.6 to 0.8)	0.5
Gender
Female	2.3 (0.4 to 4.3)	0.02
Race/Ethnicity
African American	−2.8 (−3.5 to −2.1)	<.0001
Other	−2.1 (−3.0 to −1.1)	<.0001
White	Reference
Type of trauma
Blunt	0.6 (−0.07 to 1.3)	0.08
Urbanicity
Rural	5.0 (3.8 to 6.1)	<.0001
Adult female *rural	−2.7 (−4.7 to −0.7)	0.009
African American *rural	6.4 (3.7 to 9.0)	<.0001
Random effects
County
County A	−6.0 (−12.5 to 0.6)	0.07
County B	−9.3 (−15.9 to −2.8)	0.005
County C	2.5 (−4.1 to 9.0)	0.5
County D	3.3 (−1.8 to 11.2)	0.2
County E	8.1 (1.6 to 14.7)	0.01