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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