Table 5.

Linear mixed-effects model for level of effort

Variable	Measure	Type (label)	Estimate*	SE	95% CI
Intercept	Constant	Time invariant	3.660	.021	3.619 to 3.701
Brain injury severity at IR admission	CSI brain injury score (centered at mean, 46)	Time invariant	−.024	.001	−.025 to −.023
Age at IR admission	Years (divided by 10; centered at mean, 4.4)	Time invariant	−.064	.007	−.077 to −.051
Days from injury to IR admission	No. of days (centered at mean, 26)†	Time invariant	−.006	.001	−.008 to −.004
Days from IR admission 1	No. of days from 1 to 19	Time varying	.056	.001	.054 to .058
Days from IR admission 2	No. of days from 20 to 90‡	Time varying	.020	.001	.018 to .022
PTA, present	OLOG score <25; GOAT score <75	Time varying	−.228	.015	−.257 to −.199
Agitated behavior	ABS	Time varying
	ABS total score, 14–21	(None)	(Reference)
	ABS total score, 22–27	(Mild)	−.179	.014	−.206 to −.152
	ABS total score, 28–34	(Moderate)	−.333	.021	−.374 to −.292
	ABS total score, ≥35	(Severe)	−.449	.031	−.510 to −.388

NOTE. Model is based on 1946 patients who had mean level of effort ratings computed for 38,206 days of inpatient rehabilitation.

Abbreviations: CSI, Comprehensive Severity Index; GOAT, Galveston Orientation and Amnesia Test; OLOG, Orientation Log.

^*All model variables were statistically significant at P<.0001.

^†To control for outliers, number of days from injury was capped at 3SD above the mean (mean ± SD, 26±31; capped at 119d).

^‡To control for outliers, number of days of IR was capped at 3SD above the mean (mean ± SD, 21±23; capped at 90d).