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Table 2 Determinants of package request after the reminder letter, per screening round Multivariate logistic regression

From: Keeping participants on board: increasing uptake by automated respondent reminders in an Internet-based Chlamydia Screening in the Netherlands

  Multivariate logistic regression
  Round 1 (n = 20926) Round 2 (n = 17267)
  OR (95%CI) p-value OR (95%CI) p-value
Gender     
   Male 1.0   1.0  
   Female 0.9(0.8-0.9) < 0.001 0.9(0.8-0.9) < 0.0001
Age     
   16-19 1.0   ns ns
   20-24 0.9(0.9-1.0) < 0.001   
   25-29 0.9(0.8-0.9) < 0.001   
Ethnicity     
   Dutch 1.0   1.0  
   Surinam/Antillean 1.3(1.2-1.4) < 0.001 1.2(1.1-1.3) < 0.001
   Turkish/Moroccan 1.4(1.3-1.5) < 0.001 1.4(1.2-1.5) < 0.001
   Sub Sahara African 1.4(1.1-1.3) < 0.001 1.4(1.2-1.5) < 0.001
   Western, other 1.2 (1.1-1.3) < 0.001 1.1(1.0-1.2) 0.02
   Non-Western, other 1.2(1.1-1.2) < 0.001 1.2(1.1-1.3) < 0.001
Region     
   Rotterdam 1.0   1.0  
   Amsterdam 1.3(1.2-1.3) < 0.001 1.2(1.1-1.2) < 0.001
   South-Limburg 1.3(1.1-1.4) < 0.001 1.0 (0.9-1.1) 0.61
Number of sexual partners < 6 months     
   No partner(s) 1.0   ns ns
   1steady partner 1.8(1.4-2.3) < 0.001   
   1 casual partner 2.2(1.7-2.8) < 0.001   
   ≥ 2 partners (steady partner included) 2.0(1.6-2.6) < 0.001   
Duration steady partnership     
   < 1 year 1.0   1.0  
   1-2 years 1.0(1.0-1.1) 0.27 1.1(1.0-1.2) 0.05
   3-5 years 1.0(0.9-1.1) 0.87 1.3(1.1-1.4) < 0.001
   ≥ 6 years 1.2(1.1-1.3) 0.009 1.3(1.2-1.5) < 0.001
   No steady partnership 1.0(0.9-1.1) 0.92 1.2(1.1-1.3) 0.001
Condom use last contact CP     
   Yes 1.0   1.0  
   No 0.9(0.8-1.0) 0.004 0.9(0.8-1.0) 0.004
Sexual preference     
   Heterosexual mean 1.0   ns ns
   MSM 0.8(0.6-0.9) 0.003   
Test result first screening round     
   Ct-neg NA NA 1.0  
   Ct-pos, no rescreening    1.9(1.2-3.1) 0.01
   Ct-pos, rescreened Ct-neg    1.1(0.9-1.4) 0.19
   Ct-pos, rescreened Ct-pos    0.6(0.3-1.5) 0.30
  1. OR, odds ratio; CI, confidence interval; NA, not applicable (p≥ 0.2 in univariate analysis); ns, not significant (p > 0.05 in multivariate analysis); MSM, men having sex with men, STI, sexually transmitted infection(s); SP, steady partner; CP, casual partner. 'Western other' included Oceania, North America, Canada, Europe (excluding the Netherlands and Turkey); 'Non Western other' included Central and South America, Middle East, South and South-East Asia (excluding Surinam, Antilles, Aruba, Morocco and North Africa). Non-significant in the multivariate models in both screening rounds are not shown: SES-score, educational level, living situation, ethnicity SP, age at first sex contact, concurrent partners, condom use with SP, STI history. Non-significant variables in second round only: gender, age, number of sexual partners < 6 months, sexual preference