Table 2.

Confounder-adjusted mixed-effects model predicting functioning over time.

	γ (SE)	p
Fixed effects
Model for initial status at 1 year post-acute injury
Intercept	5.254 (0.076)	<0.001
Age at injury	−0.015 (0.001)	<0.001
Injury severity (mild)	0.691 (0.065)	<0.001
Injury severity (moderate)	0.775 (0.069)	<0.001
Injury severity (severe) [reference]	-	-
Age × injury severity (mild)	0.0056 (0.0025)	0.026
Age × injury severity (moderate)	0.00009 (0.0027)	0.972
Age × injury severity (severe) [reference]	-	-
Covariates
Racial and/or ethnic minority	−0.407 (0.032)	<0.001
Non-Hispanic white [reference]	-	-
Female	−0.111 (0.033)	<0.001
Male [reference]	-	-
Married	0.120 (0.034)	<0.001
Nonmarried [reference]	-	-
Years of education	0.105 (0.005)	<0.001
Model for linear slope
Intercept	0.185 (0.013)	<0.001
Age × injury severity (mild)	−0.0037 (0.0004)	<0.001
Age × injury severity (moderate)	−0.0028 (0.0005)	<0.001
Age × injury severity (severe)	−0.0024 (0.0003)	<0.001
Model for quadratic slope
Intercept	−0.011 (0.0013)	<0.001
Age × injury severity (mild)	0.00020 (0.00004)	<0.001
Age × injury severity (moderate)	0.00011 (0.00005)	0.024
Age × injury severity (severe)	0.00010 (0.00003)	0.0041
Random effects
Level 1	σ2 (SE)
Within-person	0.946 (0.032)
Level 2	τ2 (SE)
Initial status	1.894 (0.037)
Linear slope	0.0030 (0.00047)

Notes. Total sample size after adjustments for covariate missingness, N = 11,442. SE: Standard error.