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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