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Table 3 Univariate associations between questionnaire variables and injury risk among MP recruits

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

Variable

Strata

Men

Women

  

N

Hazard ratio (95% CI)

p-value

N

Hazard ratio (95% CI)

p-value

Age

<20.0 years

1080

1.00

Referent

325

1.00

Referent

20.0-24.9 years

623

1.21 (1.04-1.46)

0.01

195

1.25 (1.00-1.55)

0.05

25.0-29.9 years

90

1.25 (0.87-1.78)

0.23

23

1.21 (0.72-2.05)

0.47

≥30.0 years

38

2.17 (1.41-3.33)

<0.01

10

2.99 (1.47-6.07)

<0.01

Body Mass Index

<25.0 kg/m2

1048

1.00

Referent

401

1.00

Referent

25.0-29.9 kg/m2

658

1.13 (0.96-1.33)

0.15

145

0.91 (0.72-1.15)

0.42

≥30 kg/m2

132

1.05 (0.77-1.43)

0.77

5

0.96 (0.31-3.01)

0.95

Smoked ≥100 Cigarettes in Life

No

1273

1.00

Referent

404

1.00

Referent

Yes

563

1.37 (1.17-1.61)

<0.01

149

1.28 (1.00-1.60)

0.05

Age Started Smoking

Never

932

1.00

Referent

316

1.00

Referent

<13 years

72

1.54 (1.07-2.23)

0.02

19

1.37 (0.78-2.40)

0.27

13-16 years

520

1.18 (0.99-1.42)

0.07

134

1.05 (0.82-1.34)

0.72

≥17 years

314

1.05 (0.83-1.31)

0.69

84

1.09 (0.81-1.46)

0.57

Days Smoked in 30 Days Before OSUT

None

1368

1.00

Referent

425

1.00

Referent

1-9 days

107

1.09 (0.77-1.53)

0.63

28

1.25 (0.79-1.96)

0.34

10-19 days

74

1.13 (0.76-1.66)

0.55

15

0.85 (0.44-1.66)

0.64

≥20 days

298

1.45 (1.19-1.77)

<0.01

85

1.20 (0.91-1.58)

0.20

Cigarettes Smoked in 30 Days Before OSUT

None

1375

1.00

Referent

425

1.00

Referent

1-9 cigarettes/day

270

1.29 (1.04-1.59)

0.02

80

1.11 (0.84-1.48)

0.46

10-19 cigarettes/day

126

1.23 (0.91-1.67)

0.17

31

1.12 (0.71-1.77)

0.61

≥20 cigarettes/day

66

1.76 (1.23-2.52)

<0.01

17

1.51 (0.88-2.59)

0.13

Used Smokeless Tobacco 30 Days Before OSUT

No

1473

1.00

Referent

536

1.00

Referent

Yes

365

1.00 (0.82-1.21)

0.96

17

0.80 (0.44-1.45)

0.46

Physical Activity Before OSUT Compared to Peers

Much less active

91

1.52 (1.06-2.17)

0.02

62

1.25 (0.81-1.93)

0.32

Less active

315

1.53 (1.20-1.96)

<0.01

128

1.14 (0.78-1.67)

0.49

Average

441

1.08 (0.85-1.38)

0.53

146

0.90 (0.62-1.31)

0.58

More active

637

0.85 (0.67-1.08)

0.18

161

0.84 (0.57-1.22)

0.35

Much more active

354

1.00

Referent

56

1.00

Referent

Exercise or Sports Frequency 2 Months Before OSUT

≤1 time/week

281

1.42 (1.12-1.80)

<0.01

90

1.39 (1.02-1.91)

0.04

2-4 time/week

912

0.97 (0.82-1.15)

0.70

310

1.13 (0.88-1.44)

0.34

≥5 time/week

707

1.00

Referent

153

1.00

Referent

Time Running/Jogging before OSUT

≤1 month

451

1.38 (1.08-1.68)

<0.01

143

1.66 (1.18-2.32)

<0.01

2-6 months

949

1.06 (0.87-1.30)

0.09

308

1.63 (1.20-2.21)

<0.01

≥7 months

437

1.00

Referent

102

1.00

Referent

Time Weight Training before OSUT

≤1 month

660

1.25 (1.04-1.51)

<0.01

274

1.47 (1.08-2.01)

0.02

2-6 months

537

1.12 (0.91-1.36)

0.11

190

1.33 (0.95-1.86)

0.09

≥7 months

640

1.00

Referent

88

1.00

Referent

Prior Lower Limb Injury

No

1327

1.00

Referent

406

1.00

Referent

Yes

510

1.19 (1.01-1.41)

0.04

147

1.08 (0.85-1.35)

0.54

Prior Injury Prevent Activities ≥1 Week

No prior injury

1327

1.00

Referent

406

1.00

Referent

No

171

1.12 (0.92-1.38)

0.26

45

1.07 (0.72-1.58)

0.38

Yes

337

1.29 (1.00-1.67)

0.05

102

1.22 (0.79-1.88)

0.75

Totally Recovered from Prior Injury

No prior injury

1325

1.00

Referent

406

1.00

Referent

No

27

2.07 (1.22-3.52)

<0.01

11

1.50 (0.77-2.92)

0.23

Yes

481

1.15 (0.97-1.37)

0.11

136

1.05 (0.82-1.33)

0.71

Age at Menarche

No menses yet

 

4

0.23 (0.03-1.67)

0.15

6-10 years

48

1.21 (0.85-1.72)

0.29

11-14 years

437

1.00

Referent

15-17 years

64

0.78 (0.56-1.10)

0.16

Gone ≥6 Months without Menstrual Cycle in Last Year

No

494

1.00

Referent

Yes

44

1.60 (1.13-2.26)

<0.01

No menses yet

4

0.25 (0.04-1.76)

0.16

Taken Birth Control Pills in Last 12 Months

No

299

1.00

Referent

Yes

249

1.11 (0.90-1.36)

0.33

Ever Pregnant

No

494

1.00

Referent

Yes

59

1.41 (1.02-1.94)

0.04