highly significantP = 0.002
The effect of age was not significant ( OR 2.04, CI 95 : 0.47–8.92, t = 0.946, P = 0.344) and the effect of year of the beginning of military service was highly significant ( OR 2.85, CI 95 : 1.46–5.60, t = 3.052, P = 0.002).