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. 2018 Jan 10;13(1):e0190200. doi: 10.1371/journal.pone.0190200

Table 5. Adjusted odds ratiosa and 95% confidence intervals for suicide versus undetermined manner of death classification by injury mechanism/cause according to documentation of a suicide note and other selected psychological/psychiatric characteristics: 17 National Violent Death Reporting System states, 2011–2013.

Mechanism/Cause
Drug intoxication Gunshot/Hanging
Suicide note Odds Ratio (95% CI) n Odds Ratio (95% CI) n
yes 45.43 (31.06, 66.58)c 1,792 8.06 (3.94, 16.49)c 7,244
no/unknown 1.00 4,813 1.00 17,604
Prior suicide attempt
yes 2.64 (2.19, 3.18)c 1,782 1.32 (0.79, 2.19) 3,680
no/unknown 1.00 4,823 1.00 21,168
Mental diagnosis
depression 1.48 (1.17, 1.87)b 2,470 1.26 (0.74, 2.15) 6,579
bipolar disorder 1.39 (0.98, 1.97) 445 0.61 (0.26, 1.39) 753
anxiety disorder 0.62 (0.38, 1.00) 171 2.20 (0.30, 16.41) 385
other 1.54 (0.93, 2.55) 157 1.68 (0.40, 7.10) 517
no/unknown 1.00 3,362 1.00 16,614

a Adjusted for autopsy status, blood alcohol concentration, specification of one or more drugs, selection mode of chief medical examiner/coroner, accreditation status/type of medicolegal death investigation system, mental treatment, recent crisis, number of personal problems, physical problem, age, sex, race/ethnicity, marital status, education, and county urbanicity.

b p < 0.01

c p < 0.001