Table 1

Comparison of ImpSS groups on health behaviours at predeployment

Health behaviours (T1)Mean (SD)
H-ImpSS
Mean (SD)
L-ImpSS
tdfSignificance (p)Effect size (r)
Alcohol
 Frequency of alcohol3.16 (1.3)2.73 (1.3)−5.491050<0.0010.17
 Amount of alcohol3.97 (2.1)3.02 (1.9)−7.691035<0.0010.23
 Frequency of HED (binge)2.49 (0.85)2.08 (0.96)−7.1791013<0.0010.22
 Current perception of intake0.16 (1.0)0.01 (0.88)−2.591030<0.010.08
Smoking
 Daily smoking rate13.15 (8.7)11.27 (8.9)−2.69649<0.010.11
 Current perception of behaviour0.24 (0.75)0.19 (0.78)−0.732527NS0.03
Driving
 Speed in built-up area1.71 (0.65)1.47 (0.58)−5.87931<0.0010.19
 Speed on motorway2.08 (0.65)1.79 (0.65)−6.96925<0.0010.22
 Seatbelt use in front as passenger0.63 (1.0)0.33 (0.78)−5.471015<0.0010.17
 Seatbelt use in rear1.43 (1.4)1.07 (1.3)−4.331069<0.0010.13
Sex
 Age at first intercourse14.9 (1.7)15.8 (2.3)6.1902<0.0010.20
 Condom use (for single group only)1.96 (1.2)1.61 (1.2)−2.64377<0.010.13
 One-night stands1.53 (1.2)0.80 (1.0)−10.411052<0.0010.31
 Pay for sex0.38 (0.74)0.22 (0.63)−3.761051<0.0010.12
 Contracted an STI0.39 (0.71)0.24 (0.59)−3.871043<0.0010.12
 Current perception of behaviour0.57 (1.1)0.32 (1.0)−3.951061<0.0010.12
 Amount of sex in the last 2 months22.3 (24.8)18.9 (20.4)−2.26877<0.050.08
  • HED, Heavy Episodic Drinking; H-ImpSS, high ImpSS; ImpSS, impulsive sensation seeking; L-ImpSS, low ImpSS; STI, Sexually Transmitted Infection.