Table 1.

Univariable and Multivariable Associations of Socio-demographic Characteristics and Active Time in Service with Suicide Attempt Among Deployed Enlisted Soldiers in the U.S. Army Reserve Components.¹

	Univariable Analyses²		Multivariable Analysis³
	OR	(95% CI)	aOR	(95% CI)	Cases (N)	Total (N)⁴	Rate⁵	Pop %⁶	SRE⁷
Gender
Male	1.0	–	1.0	–	181	3,047,781	71.3	89.8	71
Female	2.4^*	(1.7–3.2)	2.5^*	(1.8–3.5)	49	345,849	170.0	10.2	178
χ²₁	28.2^*		29.9^*
Age at Army Entry (years)
< 21	1.1	(0.7–1.5)	1.2	(0.8–1.8)	173	2,548,173	81.5	75.1	88
21–24	1.0	–	1.0	–	35	527,235	79.7	15.5	72
≥ 25	1.0	(0.6–1.7)	0.8	(0.4–1.5)	22	318,222	83.0	9.4	58
χ²₂	0.1		1.8
Current Age (years)
< 21	1.6	(1.0–2.6)	0.9	(0.4–1.9)	34	291,634	139.9	8.6	94
21–24	1.1	(0.7–1.7)	0.7	(0.4–1.3)	69	848,669	97.6	25.0	72
25–29	1.1	(0.7–1.7)	0.9	(0.5–1.5)	56	695,856	96.6	20.5	89
30–34	1.0	–	1.0	–	31	439,431	84.7	12.9	102
35–39	0.6	(0.4–1.1)	0.8	(0.4–1.5)	21	452,221	55.7	13.3	82
≥ 40	0.4^*	(0.2–0.7)	0.6	(0.3–1.3)	19	665,819	34.2	19.6	61
χ²₅	29.3^*		4.5
Race/Ethnicity
White	1.0	–	1.0	–	162	2,386,762	81.4	70.3	81
Black	1.1	(0.7–1.5)	1.1	(0.8–1.6)	35	494,235	85.0	14.6	90
Hispanic	1.0	(0.6–1.6)	1.0	(0.6–1.6)	21	301,821	83.5	8.9	81
Asian	0.7	(0.3–1.5)	0.7	(0.3–1.6)	7	141,607	59.3	4.2	60
Other	1.0	(0.4–2.5)	1.0	(0.4–2.4)	5	69,205	86.7	2.0	80
χ²₄	1.0		1.0
Education
< High School⁸	2.0^*	(1.5–2.8)	1.8^*	(1.3–2.5)	54	405,654	159.7	12.0	136
High School	1.0	–	1.0	–	155	2,473,755	75.2	72.9	74
Some College	0.7	(0.3–1.4)	0.8	(0.4–1.6)	8	188,808	50.8	5.6	58
≥ College	0.7	(0.4–1.2)	0.8	(0.5–1.5)	13	325,413	47.9	9.6	62
χ²₃	26.2^*		15.8^*
Marital Status
Never Married	1.0	–	1.0	–	100	1,652,300	72.9	48.7	58
Currently Married	1.2	(0.9–1.6)	2.0^*	(1.5–2.7)	121	1,606,521	90.4	47.3	118
Previously Married	1.0	(0.5–2.1)	1.7	(0.8–3.5)	9	134,809	81.1	4.0	100
χ²₂	2.5		21.6^*
Active Time in Service⁹
1–2 Years	1.7^*	(1.2–2.4)	2.0^*	(1.2–3.4)	121	1,124,921	129.1	33.1	130
3–4 Years	1.0	(0.6–1.6)	1.2	(0.7–2.0)	37	576,837	77.0	17.0	76
5–10 Years	1.0	–	1.0	–	38	613,638	74.3	18.1	64
≥ 11 Years	0.5^*	(0.3–0.8)	0.7	(0.3–1.3)	34	1,078,234	37.8	31.8	42
χ²₃	37.3^*		10.8^*

Total			–	–	230	3,393,630	81.3	100.0	–

Abbreviations: OR= Odds ratio, CI= Confidence Interval, aOR = adjusted odds ratio, SRE = standardized risk estimate

The sample of deployed Reserve Component enlisted soldiers (n=230 cases, 16,967 control person-months) is a subset of the total Reserve Component sample (n=70,970 person-months) from the Army Study to Assess Risk and Resilience in Servicemembers Historical Administrative Data Study. All analyses included a dummy predictor variable for calendar month and year to control for secular trends.

Parameter estimates from weighted univariable analyses (i.e., each variable modeled separately with suicide attempt)

Parameter estimates were weighted and adjusted for gender, age at army entry, current age, race/ethnicity, education, marital status, and active time in service

⁴

Total includes both cases (i.e., suicide attempters) and weighted control person-months.

⁵

Rate per 100,000 person-years, calculated based on n₁/n₂, where n₁ is the unique number of soldiers within each category and n₂ is the annual number of person-years, not person-months, in the population.

⁶

Pop% = Percent of the currently deployed Reserve Component enlisted population.

⁷

SRE = Standardized risk estimate (suicide attempters per 100,000 person-years) calculated assuming other predictors were at their sample-wide means.

⁸

<High School includes: General Educational Development credential (GED), home study diploma, occupational program certificate, correspondence school diploma, high school certificate of attendance, adult education diploma, and other non-traditional high school credentials.

⁹

Based on the number of months a soldier served on active duty (e.g., 1–2 years = 0–24 months of active service; 3–4 years = 25–48 months of active service, etc.).

p<0.05