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Table 3 Univariate analysis of risk factors for seroconverting within 9 months after childbirth

From: The prevalence, incidence and risk factors of herpes simplex virus type 2 infection among pregnant Zimbabwean women followed up nine months after childbirth

Variable n HSV-2 seroconversion Incidence Risk ratio (IRR) (95%CI) P value
Total 173 20 (11.7)   
Age group     
   <20 yrs 40 6(15.0%) Referent  
   20-24 yrs 81 10(12.4%) 0.8(0.3-12.1) 0.685
   25-29 yrs 29 1(3.5%) 0.2(0.0-1.8) 0.164
   30-34 yrs 13 2 (15.4%) 1.0(0.2-4.5) 0.973
   >34 yrs 10 1(10.0%) 0.7(0.1-5.0) 0.692
Marital status*     
   Single 5 0 Referent  
   Married 167 20(12.0%) Incalculable 1.000**
Polygamy     
   No 160 16(10.0%) Referent  
   Yes 9 4(44.4%) 4.4(1.9-10.6) 0.001**
Educational level     
   >Primary school 149 17(11.4%) Referent  
   = <Primary school 24 3(12.5%) 1.1(0.3-3.5) 0.877**
Age at sexual debut (years)*     
   >16 years 153 14 (9.2%) Referent  
   ≤16 years 18 6 (33.3%) 3.6(1.6-8.3) 0.002
Abstain from sex during pregnancy*     
   Yes 40 4 (10.0%) Referent  
   No 131 16 (12.2%) 1.2 (0.4-3.5%) 0.706**
Resumed sex after delivery*     
   Six weeks after birth     
No 88 11(12.6%) Referent  
Yes 40 6 (15.0%) 1.2 (0.5-3.0) 0.699
   Four months after birth     
No 10 1 (10.0%) Referent  
Yes 74 10 (13.5%) 1.4 (0.2-9.6) 0.763**
   Nine months after birth     
No 12 0 (0) Referent  
Yes 131 12 (9.2) Incalculable 0.273**
Cleanse the vagina*     
   No 7 0 (0) Referent  
   Yes 166 20 (12.1) Incalculable 0.329**
Ever used intravaginal herbs*     
   No 147 16 (10.9%) Referent  
   Yes 25 4 (16.0%) 1.5 (0.5-4.0) 0.461**
Clinical genital ulcer*     
   No 151 18 (11.3%) Referent  
   Yes 2 0 Incalculable 0.615**
Clinical genital warts*     
   No 146 15 (10.4%) Referent  
   Yes 9 2 (22.2%) 2.2 (0.6-8.1) 0.251**
  1. *denominator less than 173. ** Fisher's Exact p values.