Table 1. Annual Number of Soldiers and Incidence Rates Within Nonfatal Event Categories Among Active-Duty Regular Army Soldiers in the Army STARRS 2004–2009 Historical Administrative Data Study (HADS) Sample (n = 205,566).

I. Annual Number of Soldiers by Event Category^a

	Soldiers Within Category per Year (N)

Event Category	2004	2005	2006	2007	2008	2009
Suicide Attempt	885	1,403	1,706	1,949	2,110	2,033
Definite	185	524	712	740	799	695
Probable	738	1,026	1,218	1,461	1,572	1,565
Suspicious Injury	275	280	284	278	318	307
Suicide Ideation	9	189	1,930	2,821	3,737	4,567
Definite	9	29	36	453	759	907
Probable	—	160	1,904	2,515	3,242	3,995

II. Annual Incidence Rate per 100,000 Person-Years by Event Category ^b

	Incidence Rate Within Category per Year

Event Category	2004	2005	2006	2007	2008	2009	Average Annual Rate

Suicide Attempt	178.8	288.4	341.0	384.5	400.4	369.6	329.0
Definite	37.4	107.7	142.3	146.0	151.6	126.4	119.2
Probable	149.1	210.9	243.5	288.2	298.3	284.5	247.3
Suspicious Injury	55.6	57.6	56.8	54.8	60.3	55.8	56.8
Suicide Ideation^c	—	—	385.8	556.5	709.1	830.3	702.3
Definite	—	—	—	89.4	144.0	164.9	133.8
Probable	—	—	380.6	496.1	615.2	726.3	615.7

Note. The sample of 205,566 person-months includes all 21,740 regular Army soldiers (i.e., excluding those in the U.S. Army National Guard and Army Reserve) with a suicide attempt, suspicious injury, or suicide ideation in the administrative records during the years 2004–2009 plus a 1:200 stratified probability sample of all other active-duty regular Army person-months in the population exclusive of cases (i.e., soldiers with a suicide attempt, suspicious injury, or suicide ideation) and person-months associated with death (i.e., suicides, combat deaths, homicides, and deaths due to other injuries or illnesses). All records in the 1:200 sample were assigned a weight of 200 to adjust for the undersampling of months not associated with suicide attempt, suspicious injury, or suicide ideation.

Soldiers are unique within each cell (event category by year) but may appear in more than one category and in more than one year within the same category.

Annual incidence rates were calculated based on n₁/n₂, where n₁ is the unique number of soldiers within each category in each year (see part II above) and n₂ is the annual number of person-years, not person-months, in the population (2004 = 494,909 person-years; 2005 = 486,447; 2006 = 500,251; 2007 = 506,946; 2008 = 526,970; 2009 = 550,056). As noted previously, the 205,566 person-months in the sample represent a 1:200 sample of the 37.0 million person-months (3.08 million person-years) in the population of regular Army soldiers (i.e., excluding those in the U.S. Army National Guard and Army Reserve) on active duty for one or more months in calendar years 2004–2009.

Rates for definite suicide ideation were not calculated for 2004–2006 because suicidal ideation was introduced in the ASER/DoDSER until 2007; rates for probable suicide ideation were not calculated for 2004–2005 because the V62.84 code was not introduced until late 2005; average annual rates for definite and probable suicide ideation were calculated using the annual rates from 2007–2009, the only years when all suicide ideation codes where available.