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Table 2 Relative change in 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

RR

(95% CI)

P value

STAGE I

Crude RR

 

Pre

1

 

<0.001~

 

During

2.23

(2.22 to 2.41)

 
 

Post

1.38

(1.37 to 1.38)

 

STAGE II

Adjusted RRx

 

Pre

1

 

0.50~

 

During

0.91

(0.72 to 1.14)

 
 

Post

0.88

(0.69 to 1.11)

 

STAGE III

Sex x

Male

Pre

1

 

<0.001~

 

During

1.10

(1.02 to 1.19)

 
 

Post

0.91

(0.84 to 0.99)

 

Female

Pre

1

  
 

During

0.71

(0.66 to 0.77)

 
 

Post

0.72

(0.66 to 0.79)

 

Age-group x

15-19 years

 

1

 

<0.001*

 

20-24 years

 

0.67

(0.65 to 0.69)

 

Socio-economic class x

1 (most deprived)

 

1

 

<0.001*

2

 

0.59

(0.57 to 0.62)

 

3

 

0.38

(0.36 to 0.39)

 

4

 

0.27

(0.26 to 0.28)

 

5 (least deprived)

 

0.23

(0.22 to 0.24)

 

Ethnicity x

White

Pre

1

 

<0.001~

 

During

0.91

(0.83 to 1.00)

 
 

Post

0.79

(0.72 to 0.88)

 

Black

Pre

1

  
 

During

0.78

(0.71 to 0.86)

 
 

Post

0.74

(0.67 to 0.82)

 

Asian

Pre

1

  
 

During

1.12

(1.01 to 1.24)

 
 

Post

0.98

(0.88 to 1.09)

 

Other

Pre

1

  
 

During

0.81

(0.74 to 0.90)

 
  

Post

0.75

(0.67 to 0.83)

 
  1. Legend: RR, Risk ratio; CI, Confidence interval x adjusted for cyclical and secular trends, *Wald test for socio-demographic variable, ~ likelihood ratio test for interaction in stage III, phase in stages I and II.