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Table 1 Effect of interventions

From: Improving recruitment to a study of telehealth management for COPD: a cluster randomised controlled ‘study within a trial’ (SWAT) of a multimedia information resource

Outcome

Intervention

Differences in proportions

(95% CI)

aOdds ratio

(95% CI)

Standard invitation material

Multimedia resource

No.

%

No.

%

Responded to invitation

464/2280

20.4%

412/1934

21.3%

0.0095 (−0.015 to 0.341)

1.024 (0.787 to 1.333)

Randomised to main trial

247/2280

10.8%

185/1934

9.6%

−0.013 (− 0.031 to 0.006)

0.844 (0.584 to 1.218)

Retained at 6 months’ follow-up

231/2280

10.1%

171/1934

8.8%

−0.013 (− 0.031 to 0.005)

0.836 (0.571 to 1.224)

Retained at 12 months’ follow-up

223/2280

9.8%

159/1934

8.2%

−0.016 (− 0.033 to 0.002)

0.799 (0.542 to 1.178)

  1. CI confidence interval
  2. aodds ratios are adjusted for stratification factor – area