Mental health: A cause or consequence of injury? A population-based matched cohort study

BMC Public Health

Table 4 Rates of post-injury mental health physician claims, for injured and non-injured cohorts, with rate ratios and 95% confidence intervals, by severity of pre-existing mental health condition

Pre-existing Mental Health Condition	Injured			Non-Injured			Unadjusted Rate Ratio	95% Confidence Interval	Adjusted Rate Ratio *	95% Confidence Interval
	N	Claims	Rate /10 PYs	N	Claims	Rate /10 PYs
No condition ^a	16,984	54,383	3.60	19,089	36,936	2.20	1.69	1.61–1.77	1.56	1.49–1.64
Mild condition ^b	2,550	30,385	13.79	1,520	12,932	9.59	1.46	1.33–1.61	1.36	1.23–1.50
Moderate-severe ^c	1,498	78,697	63.41	423	15,791	42.50	1.56	1.37–1.78	1.49	1.30–1.71
Total	21,032	163,465	8.82	21,032	65,659	3.55	2.65	2.53–2.77	1.53	1.47–1.59

* Adjusted for age, gender, place of residence, and comorbidities in 12 months prior to injury date (including CCI, cumulative LOS, number of physician claims, pre-existing musculoskeletal condition and previous injuries)
^a No admissions or physician claims for that condition in pre-injury period
^b 1–3 physician claims and no admissions for that condition in pre-injury period
^c 1 or more admissions and/or 4 or more physician claims for that condition in pre-injury period

ISSN: 1471-2458