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Table 3 Risk factors for incidence of STI during follow up: results from cox regression models

From: High prevalence and incidence of sexually transmitted infections among women living in Kwazulu-Natal, South Africa

Variable Univariate analysis p-value Multivariate analysis p-value
HR (95% CI) HR (95% CI)
Any STI at baseline 1.61 (1.30-2.00) - 1.52 (1.22-1.88) 0.000
Age     
≤25 1.64 (1.36-2.00) <0.001 1.40 (1.14-1.74) 0.001
25-34 1.19 (0.97-1.46) 0.100 1.10 (0.89-1.37) 0.370
35+ 1 -   
District     
Rural 0.93 (0.69-1.25) 0.628 -  
Urban 1 -   
Employed/income     
No 1.35 (1.10-1.66) 0.0038 -  
Yes 1 -   
Level of education     
High school or more 1 -   
Less than high school 1.25 (1.06-1.46) 0.006 -  
Contraceptive use     
At least one form of contraceptive1 1 -   
None 1.33 (1.13-1.55) <0.001 1.40 (1.19-1.64) 0.000
Marital status     
Married 1 -   
Not married 1.84 (1.49-2.27) <0.0001 1.54 (1.22-1.94) 0.000
Cohabitation status     
Yes 1 -   
No 1.43 (1.21-1.68) <0.0001 -  
Condom used during last sexual act     
No 1.00 (0.86-1.16) 0.98 -  
Yes 1 -   
  1. CI, confidence interval; HR Hazard ratio.
  2. 1including condom, injectables, pills, traditional methods.