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Table 3 Multivariate Association between Stress Fractures, Body Fat, and Race/Ethnicity

From: Association between stress fracture incidence and predicted body fat in United States Army Basic Combat Training recruits

Sex Variable Strata n Injury Incidence (cases/ 1000) Multivariate Logistic Regression Odds Ratio (95%CI) p-value
Men Body Fat < 8.90% 47,545 23.7 1.27 (1.16–1.39) < 0.01
8.90–10.62% 46,603 18.2 0.98 (0.89–1.07) 0.61
10.63–12.08% 47,382 16.6 0.89 (0.81–0.98) 0.02
12.09–13.51% 47,706 16.5 0.89 (0.80–0.97) 0.01
13.52–15.05% 47,431 16.6 0.89 (0.81–0.99) 0.04
15.06–16.73% 47,778 18.7 1.00 Referent
16.74–18.60% 47,579 20.0 1.07 (0.97–1.17) 0.17
18.61–20.61% 47,525 20.4 1.08 (0.99–1.19) 0.09
20.62–23.52% 47,605 21.1 1.13 (1.03–1.23) 0.01
≥ 23.53% 47,591 21.4 1.17 (1.07–1.28) < 0.01
Race/Ethnicity Black 72,155 12.2 1.00 Referent
White 324,089 21.0 1.72 (1.60–1.85) < 0.01
Hispanic 52,684 19.3 1.56 (1.43–1.71) < 0.01
Asian 15,439 17.0 1.38 (1.20–1.59) < 0.01
Am Indian 4812 21.8 1.75 (1.42–2.15) < 0.01
Other 1393 25.8 2.12 (1.52–2.98) < 0.01
Unknown 5173 16.0 1.31 (1.04–1.64) 0.02
Women Body Fat < 22.90% 10,779 90.1 1.22 (1.11–1.35) < 0.01
22.90–24.56% 10,802 81.4 1.09 (0.98–1.20) 0.10
24.57–25.97% 10,805 80.2 1.06 (0.96–1.18) 0.22
25.98–27.23% 10,752 79.6 1.05 (0.95–1.16) 0.35
27.24–28.53% 10,712 76.6 1.00 Referent
28.54–29.55% 10,827 81.1 1.07 (0.97–1.18) 0.21
29.56–30.78% 10,842 80.8 1.06 (0.96–1.17) 0.23
30.79–32.21% 10,788 72.6 0.95 (0.86–1.06) 0.35
32.22–34.20% 10,793 77.4 1.03 (0.93–1.13) 0.63
≥ 34.21% 10,806 79.2 1.07 (0.97–1.18) 0.18
Race/Ethnicity Black 31,661 60.9 1.00 Referent
White 55,580 90.5 1.54 (1.46–1.63) < 0.01
Hispanic 13,388 81.5 1.37 (1.27–1.48) < 0.01
Asian 3608 76.8 1.28 (1.12–1.46) < 0.01
Am Indian 1784 81.3 1.37 (1.15–1.64) < 0.01
Other 428 102.8 1.77 (1.29–2.43) < 0.01
Unknown 1457 74.1 1.23 (1.01–1.51) 0.04