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Table 3 Multivariate association between variables and injury risk among combat engineer recruits

From: A prospective investigation of injury incidence and risk factors among army recruits in combat engineer training

Variable

Strata

N

Hazard ratio (95% CI)

p-value

Age

<20.0 years

716

1.00

Referent

20.0-24.9 years

684

1.16 (0.98-1.36)

0.08

25.0-29.9 years

143

1.48 (1.13-1.94)

<0.01

≥30.0 years

77

2.36 (1.69-3.28)

<0.01

BMI

<18.5 kg/m2

27

2.39 (1.52-3.75)

<0.01

18.5-24.9 kg/m2

844

1.00

Referent

25.0-29.9 kg/m2

623

0.86 (0.73-1.00)

0.06

≥30 kg/m2

126

1.16 (0.90-1.51)

0.26

Physical activity before basic training compared to peers

Much less active

70

2.46 (1.73-3.49)

<0.01

Less active

289

1.85 (1.45-2.37)

<0.01

Average

418

1.15 (0.90-1.47)

0.28

More active

579

1.13 (0.90-1.42)

0.30

Much more active

264

1.00

Referent

Totally recovered from prior injury

No prior injury

1226

1.00

Referent

No

18

2.21 (1.20-4.08)

0.01

Yes

376

1.15 (0.98-1.36)

0.09

Educational level

<High school graduate

98

1.43 (1.09-1.89)

0.01

High school graduate

1305

1.00

Referent

Some college

149

0.94 (0.73-1.22)

0.66

≥College graduate

51

0.62 (0.39-1.00)

0.05

 

Unknown

17

0.86 (0.41-1.82)

0.70