Table 3.

 Demographic characteristics relating to any use (logistic regression) and frequent use (negative binomial regression) of the system

	Logistic regression model (N = 822) (>0 reports vs. 0 reports)		Negative binomial model (N = 560) (among frequent users: ≥3 reports)
	Odds ratio (95% CI)	P‐value	Incidence rate ratio (95% CI)	P‐value
	Gender
Male (reference group)
Female	1.05 (0.58, 1.91)	0.87	0.95 (0.83, 1.08)	0.41
Race/ethnicity
White (reference group)
Black	1.06 (0.55, 2.02)	0.87	0.83 (0.71, −0.98)	0.03
Other	0.70 (0.35, 1.37)	0.29	1.05 (0.88, 1.25)	0.59
Age group (years)
<26 (reference group)
26–35	1.04 (0.33, 3.28)	0.95	2.08 (1.31, 3.30)	<0.01
36–45	1.19 (0.37, 3.76)	0.77	1.92 (1.20, 3.07)	<0.01
>46	1.23 (0.37, 4.07)	0.73	1.95 (1.21, 3.13)	<0.01
Rank
Junior Enlisted Personnel (E1–E4) (reference group)
Senior Enlisted Personnel (E5–E9, W1–W5)	0.85 (0.24, 3.01)	0.80	1.06 (0.66, 1.68)	0.82
Officer	1.78 (0.48, 6.66)	0.39	1.03 (0.64, 1.64)	0.92
Civilian	1.79 (0.45, 7.11)	0.41	1.04 (0.64, 1.67)	0.89
Goodness‐of‐fit	Hosmer and Lemeshow, P = 0.83		Deviance/d.f. = 1.03; Pearson chi‐square/d.f. = 1.03

E1–E4, E5–E9 are enlisted soldiers (grades 1–4 are junior; 5–9 are more senior enlisted soldiers). W1–W5 (Warrant officers) are more senior than enlisted men but are not commissioned officers.