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. Author manuscript; available in PMC: 2020 Oct 1.
Published in final edited form as: Psychiatry. 2019 Fall;82(3):240–255. doi: 10.1080/00332747.2019.1653056

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

1

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.

2

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

3

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