Table 3.

Predictors of Higher NPD Count, and Effect of Mild TBI on NPD Count at 3 Months: Unadjusted and Adjusted Poisson Log-Linear Regression Analysis

		Unadjusted analysis		Adjusted analysis
	N	Mean ratio (95% CI)	p Value	Mean ratio (95% CI)	p Value
mTBI vs. OI	283	3.647 (1.264, 15.405)	0.014	3.724 (1.264, 15.945)	0.015
Age, per year	283	1.006 (0.833, 1.222)	0.951
Female sex	283	0.834 (0.324, 1.914)	0.680
Socioeconomic Status, per unit	283	0.709 (0.473, 1.047)	0.084	0.618 (0.383, 0.973)	0.037
Race (Minority vs. White	283	0.592 (0.197, 1.462)	0.271
Pre-injury lifetime psychiatric disorder	283	2.876 (1.306, 6.614)	0.009	2.284 (1.026, 5.305)	0.043
Pre-injury Vineland Adaptive Behavior Composite, per unit	283	0.993 (0.963, 1.023)	0.647
Family Psychiatric History, high vs. low	280	2.833 (1.260, 6.944)	0.011	2.748 (1.201, 6.839)	0.016
McMaster Structured Interview of Family Function Clinical Rating Scale (McSIFF CRS), per unit	255	0.683 (0.498, 0.950)	0.024
Family Assessment Device (mother; FAD), per unit	280	0.935 (0.358, 2.277)	0.886
WASI-II Full-Scale IQ, per unit	281	0.982 (0.955, 1.010)	0.161
WRAT-4 Sentence Comprehension	282	0.989 (0.966, 1.012)	0.331
WRAT-4 Calculation Skills	282	0.996 (0.972, 1.021)	0.733
Injury Severity Score	283	0.901 (0.717, 1.093)	0.311

Bolded numbers represent variables with p < 0.15 values in single-predictor analyses, which were included in the starting model for multi-predictor analyses.

The results are reported as mean ratios and 95% confidence intervals, based on the likelihood ratio test.

NPD, novel psychiatric disorder; TBI, traumatic brain injury; CI, confidence interval; mTBI, mild traumatic brain injury; OI, orthopedic injury; WASI-II, Wechsler Abbreviated Scale of Intelligence Second Edition; WRAT-4, Wide Range Achievement Test-4th Edition.