Association between traumatic brain injury and mental health care utilization: evidence from the Canadian Community Health Survey

Table 4 Model comparison using likelihood ratio tests and Akaike information criterion

Model^a	LRT^b	p-value	AIC^c
Model 1^d: age 5 levels, income 5 levels	–	–	32.11163
Model 2^e: age 4 levels, income 4 levels	1.226908e−05	0.99999	28.11165
Model 3^f: age 3 levels, income 3 levels	3.007202e−05	1.0000	24.11168
Model 4^g: age 2 levels, income 2 levels	0.0004498243	1.0000	20.1123
Model 5^h: age 2 levels, income 3 levels	0.0004483501	1.0000	22.1123

^aAll models include injury type (TBI/non-injured), sex(male/female), race(white/non-white), education (less than secondary/secondary/ postsecondary), mental health conditions (yes/no), heavy drinking (yes/no)
^bLikelihood ratio test
^cAkaike information criterion
^dAge categorized as 5 levels: 12–17, 18–24, 25–44, 45–64, ≥ 65 years; income categorized as 5 levels: no income or < $20,000, $20,000–$39,000, $40,000–$59,000. $60,000–$79,000, ≥ $80,000
^eAge categorized as 4 levels:12–24, 25–44, 45–64, ≥ 65 years; income categorized as 4 levels: $0–$39,000, $40,000–$59,000, $60,000–$79,000, ≥ $80,000
^fAge categorized as 3 levels: 12–44, 45–64, ≥ 65 years; income categorized as 3 levels: $0–$39,000, $40,000–$79,000, ≥ $80,000
^gAge categorized as 2 levels: 12–64, ≥ 65 years; income categorized as 2 levels: $0–$39,000, ≥ $40,000
^hAge categorized as 2 levels: 12–64, ≥ 65 years; income categorized as 3 levels: $0–$39,000, $40,000–$79,000, ≥ $80,000

ISSN: 2197-1714