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Table 2 Response rate to participation in the Link-Up Study among existing participants in The 45 and Up Study, by area of residence and randomisation status

From: Randomised trial investigating the relationship of response rate for blood sample donation to site of biospecimen collection, fasting status and reminder letter: The 45 and Up Study

Group

Total

       Participation rate ratio (RR)

P (χ 2 test)

 

N

n (%)

RR (95% CI)

 

Total

2340

762 (33%)

  

Wagga Wagga

1002

   

Group 1 Dedicated Clinic without fasting

334

154 (46%)

1.00

 

Group 2 Dedicated Clinic with fasting

334

156 (47%)

1.01 (0.91-1.11)

Fasting vs. non fasting: p = 0.87

Group 3 Pathology Service no reminder

334

100 (30%)

0.64 (0.53-0.79)

Clinic vs. pathology service: p <0.01

Parramatta

1338

   

Group 1 Dedicated Clinic without fasting

334

103 (31%)

1.00

 

Group 2 Dedicated Clinic with fasting

334

101 (30%)

0.99 (0.86-1.13)

Fasting vs non fasting: p = 0.88

Group 3 Pathology Service no reminder

334

72 (22%)

0.69 (0.53-0.90)

Clinic vs pathology service: p <0.01

Group 4 Pathology Service with reminder

336

76 (23%)

1.01 (0.93-1.09)

Reminder vs no reminder: p = 0.74