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Table 2 Factors affecting time to colour change of the menstrual cup, as observed during visits to the study nurse, Western Kenya, 2012–2013

From: Use of menstrual cups among school girls: longitudinal observations nested in a randomised controlled feasibility study in rural western Kenya

Variable n Univariate Hazard ratio, 95% CIa p-value Multivariate Hazard ratio, 95% CIa p-value
Class at time of enrolment
 5 or 6 61 0.73, 0.57–0.94 0.013 NS  
 7 or 8 131 Reference    
Age at enrolment (years)
 14 93 Reference   NS  
 15 80 1.17, 0.88–1.56 0.268   
 16 19 3.81, 1.59–9.14 0.003   
Socio-economic status household of girls
 Poorest 2 quintiles 22 1.12, 0.73–1.72 0.589 Not included  
 Higher 3 SES quintiles 138 0.90, 0.70–1.15 0.410   
 No information 32 Reference    
Material used for menstruation before enrolment
 Used some pads 169 Reference   Not included  
 Cloths/other 23 0.92, 0.48–1.73 0.788   
Time since menarche at enrolment
  < 1 year 51 1.01, 0.63–1.62 0.958 Not included  
  ≥ 1 year 141 Reference    
Enrolment year
 2012 126 Reference   Reference  
 2013 66 3.93, 2.09–7.38 < 0.001 3.93, 2.09–7.38 < 0.001
Enrolled before/after peer educationb
 Before peer education 102 Reference   NS  
 After peer education 90 2.77, 1.25–6.13 0.012   
  1. CI confidence interval, NS not significant in multivariate model
  2. Note: a hazard ratio > 1 indicates a shorter duration to cup colour change
  3. aSchool included as cluster variable
  4. bPeer-to-peer classroom training conducted by ‘champion’ secondary schoolgirls from a school in a contiguous area in October 2012