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Table 4 Relative change in positivity of Chlamydia testing during and after the campaign and by socio-demographic characteristics

From: Do sexual health campaigns work? An outcome evaluation of a media campaign to increase chlamydia testing among young people aged 15–24 in England

  

Campaign Phase

OR

(95% CI)

P value*

STAGE I

Crude OR

 

Pre

1

 

<0.001

During

0.70

(0.67 to 0.71)

 

Post

0.77

(0.76 to 0.79)

 

STAGE II

Adjusted OR x

 

Pre

1

 

<0.001

 

During

1.18

(1.13 to 1.23)

 
 

Post

1.40

(1.30 to 1.51)

 

STAGE III

Sex x

Male

Pre

1

 

<0.001

 

During

1.04

(0.99 to 1.10)

 
 

Post

1.30

(1.20 to 1.41)

 

Female

Pre

1

  
 

During

1.19

(1.14 to 1.25)

 
 

Post

1.35

(1.25 to 1.46)

 

unknown

Pre

1

  
 

During

1.26

(0.88 to 1.81)

 
 

Post

0.85

(0.50 to 1.43)

 

Age-group x

15-19 years

Pre

1

 

<0.001

 

During

1.10

(1.05 to 1.15)

 
 

Post

1.31

(1.21 to 1.42)

 

20-24 years

Pre

1

  
 

During

1.20

(1.15 to 1.26)

 
 

Post

1.37

(1.27 to 1.48)

 

Socio-economic class x

1 (most deprived)

Pre

1

 

0.005

 

During

1.13

(1.08 to 1.19)

 
 

Post

1.30

(1.20 to 1.41)

 

2

Pre

1

  
 

During

1.13

(1.07 to 1.19)

 
 

Post

1.34

(1.24 to 1.46)

 

3

Pre

1

  
 

During

1.16

(1.10 to 1.22)

 
 

Post

1.36

(1.25 to 1.48)

 

4

Pre

1

  
 

During

1.16

(1.09 to 1.23)

 
 

Post

1.44

(1.32 to 1.57)

 

5 (least deprived)

Pre

1

  
 

During

1.17

(1.10 to 1.25)

 
 

Post

1.36

(1.24 to 1.49)

 

unknown

Pre

1

  
 

During

1.06

(0.93 to 1.20)

 
 

Post

0.98

(0.81 to 1.17)

 

Ethnicity x

White

Pre

1

 

<0.001

 

During

1.15

(1.10 to 1.20)

 
 

Post

1.35

(1.25 to 1.46)

 

Black

Pre

1

  
 

During

1.25

(1.15 to 1.35)

 
 

Post

1.57

(1.41 to 1.75)

 

Asian

Pre

1

  
 

During

1.25

(1.05 to 1.49)

 
 

Post

1.40

(1.13 to 1.74)

 

Other

Pre

1

  
 

During

1.25

(1.14 to 1.37)

 
 

Post

1.46

(1.29 to 1.65)

 

unknown

Pre

1

  
 

During

1.08

(1.03 to 1.14)

 
 

Post

1.23

(1.13 to 1.33)

 

Sexual behaviour x

High risk

Pre

1

 

<0.001

 

During

1.21

(1.16 to 1.27)

 
 

Post

1.36

(1.25 to 1.46)

 

Low risk

Pre

1

  
 

During

1.10

(1.04 to 1.17)

 
 

Post

1.42

(1.30 to 1.55)

 

unknown

Pre

1

  
 

During

1.08

(1.03 to 1.13)

 
  

Post

1.28

(1.18 to 1.39)

 
  1. Legend OR, Odds ratio; CI, Confidence interval x adjusted for cyclical and secular trends *likelihood ratio test for interaction in stage III, phase in stages I and II.