Table 3.
Predictors of chlamydia in young heterosexual female backpackers and non-backpackers
| Young female heterosexual backpackers, n=2937 |
Young female heterosexual non-backpackers, n=3376 |
|||||||
| Univariate |
Multivariate |
Univariate |
Multivariate |
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| OR (95% CI) | p Value | OR (95% CI) | p Value | OR (95% CI) | p Value | OR (95% CI) | p Value | |
| Age group (years) | ||||||||
| 26–30 | 1 | 0.106 | 1 | 0.065 | ||||
| ≤25 | 1.30 (0.95 to 1.79) | – | 1.37 (0.98 to 1.91) | – | ||||
| Marital status | ||||||||
| Other | 1 | 0.434 | 1 | 0.104 | ||||
| Never married | 1.27 (0.70 to 2.32) | – | 1.48 (0.92 to 2.36) | – | ||||
| Current cigarette smoker | ||||||||
| No | 1 | 0.304 | 1 | 0.0504 | – | |||
| Yes | 1.17 (0.87 to 1.58) | – | 1.39 (0.99 to 1.93) | |||||
| Excess alcohol* | ||||||||
| No | 1 | 0.331 | 1 | 0.043 | ||||
| Yes | 1.17 (0.85 to 1.62) | – | 1.54 (1.01 to 2.34) | – | ||||
| Reason for presentation | ||||||||
| Other | 1 | <0.001 | 1 | <0.001 | 1 | 1 | <0.001 | |
| Known STI contact | 2.54 (1.58 to 4.08) | 2.37 (1.47 to 3.82) | 3.54 (2.18 to 5.74) | |||||
| Number of sex partners (past 3 months) | ||||||||
| 0 or 1 | 1 | 1 | 1 | 1 | ||||
| 2 | 1.25 (0.86 to 1.81) | 0.243 | 1.17 (0.80 to 1.71) | 0.413 | 1.57 (1.02 to 2.42) | 0.004 | 1.48 (0.95 to 2.30) | 0.079 |
| 3 or more | 2.07 (1.38 to 3.11) | <0.001 | 1.89 (1.25 to 2.86) | 0.003 | 3.05 (1.93 to 4.80) | <0.001 | 3.00 (1.89 to 4.77) | <0.001 |
| Consistent condom use (past 3 months) | ||||||||
| Yes | 1 | <0.001 | 1 | 1 | 0.002 | 1 | 0.011 | |
| No | 2.50 (1.68 to 3.72) | 2.33 (1.56 to 3.48) | <0.001 | 2.00 (1.30 to 3.10) | 1.78 (1.14 to 2.76) | |||
| Past chlamydia diagnosis | ||||||||
| No | 1 | 0.192 | – | 1 | 0.362 | – | ||
| Yes | 1.32 (0.87 to 1.99) | – | 1.28 (0.75 to 2.18) | |||||
*
Alcohol intake of average 280 g for men and 140 g for women.
STI, sexually transmissible infection.