Table 5

Logistic regression analyses of relationships between sex related behaviour and individuals' demographics and substance use behaviour

Five or more partners
 Sex without a condom
 Sex without any birth control
 Paid for sex
 Exchanged sex for drugs
 Had an STI test
 Had regretted sex after alcohol or drugs

AOR 95%CI
 AOR 95%CI
 AOR 95%CI
 AOR 95%CI
 AOR 95%CI
 AOR 95%CI
 AOR 95%CI
Age






     26–35 (Ref)




***
 **
     21–25




0.41 0.27,0.61
 2.26 1.28,3.98
     16–20




0.88 0.61,1.27
 1.38 0.77,2.46
Gender






     Female (Ref)
 **

***


     Male
 1.77 1.25,2.52

5.60 2.67,11.73


Relationship Status






     Not single (Ref)
 ***
 ***
**

**
     Single
 2.30 1.60,3.31
 0.58 0.44,0.77
2.43 1.30,4.53

1.80 1.23,2.64
Sexuality






     Heterosexual (Ref)
 ***


**
 **
 **
     Other
 4.29 2.81,6.56


4.06 1.44,11.42
 1.99 1.35,2.93
 2.05 1.30,3.23
Been drunk in last four weeks






     No (Ref)
 *





     Yes
 1.59 1.03,2.46





Cannabis use






     Never used (Ref)
*
 *


*
     Experimented
1.19 0.77,1.85
 1.45 0.94,2.24


2.69 1.26,5.73
     Ex user
1.82 1.15,2.89
 1.70 1.11,2.60


2.16 1.01,4.59
     Occasional user
1.59 0.95,2.66
 1.31 0.80,2.13


2.22 0.97,5.09
     Regular user
1.75 1.16,2.65
 1.86 1.24,2.76


3.29 1.67,6.48
Cocaine use






     Never used (Ref)
 ***
**
 **
**
     Experimented
 1.42 0.84,2.40
1.56 1.04,2.34
 1.77 0.75,4.20
1.17 0.76,1.82
     Ex user
 1.50 0.74,3.02
1.32 0.77,2.27
 3.56 1.45,8.73
2.13 1.22,3.69
     Occasional user
 2.02 1.11,3.68
1.32 0.78,2.22
 1.44 0.46,4.50
1.83 1.10,3.07
     Regular user
 5.65 3.12,10.23
2.71 1.61,4.55
 5.13 2.22,11.87
2.47 1.50,4.09
Ecstasy use






     Never used (Ref)





**
     Experimented





2.12 1.22,3.69
     Ex user





2.66 1.47,4.83
     Occasional user





2.10 1.14,3.87
     Regular user





2.77 1.44,5.35
Country






     Portugal (Ref)
 ***
 ***
 ***
 **
***
     Spain
 0.40 0.17,0.95
 1.42 0.79,2.55
 0.54 0.30,0.97
 2.59 0.62,10.80
0.77 0.42,1.42
     Italy
 1.05 0.50,2.18
 1.80 0.99,3.28
 0.92 0.53,1.59
 2.21 0.51,9.49
0.69 0.38,1.26
     Greece
 1.01 0.51,1.99
 1.04 0.64,1.71
 1.66 1.02,2.71
 7.39 2.05,26.65
0.83 0.48,1.42
     Slovenia
 0.43 0.18,1.03
 3.76 1.98,7.14
 1.15 0.68,1.95
 0.52 0.05,5.19
0.34 0.17,0.65
     Czech Republic
 0.96 0.48,1.93
 3.81 1.98,7.31
 0.65 0.39,1.09
 1.27 0.24,6.55
0.43 0.23,0.80
     Austria
 2.36 1.23,4.54
 1.34 0.78,2.28
 0.42 0.25,0.73
 6.10 1.63,22.83
1.68 0.97,2.89
     Germany
 1.41 0.72,2.75
 2.65 1.43,4.90
 0.50 0.29,0.87
 0.92 0.15,5.77
1.08 0.62,1.88
     UK
 0.40 0.19,0.88
 1.06 0.63,1.81
 0.42 0.24,0.72
 1.87 0.43,8.11
0.66 0.38,1.16

* p < .05; ** p < .01; *** p < .001; ns = not significant; AOR = Adjusted Odds Ratio; 95%CI = 95% Confidence Interval; Ref = Reference Category.

Note All analyses limited to those who have had sex in last 12 months. Backward conditional logistic regression was utilised with non-significant factors being removed from the final model. Frequency of alcohol use was an independent variable in all analyses but was not significantly related to any dependents and therefore is not shown above.

Bellis et al. BMC Public Health 2008 8:155   doi:10.1186/1471-2458-8-155