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Table 1 Breakdown of volunteer responses, ineligibility and recruitment rates to each Facebook campaign

From: Challenges and practical recommendations for successfully recruiting inactive, statin-free older adults to clinical trials

Month of campaign

Length of campaign (days)

Reach

Impressions

Frequency

Responses

Ineligible

Reason

Did not complete CT

Jan 18

29

3981

9019

2.27

28

28

9 (32.1%)

Physical activity

0

7 (25%)

Statins

3 (10.7%)

Physical activity and statins

4 (14.3%)

PMH

2 (7.1)

No response

2 (7.1%)

Declined to take part

1 (3.6%)

Failed screening/familiarisation

Feb 18

26

5984

13,651

2.28

13

13

2 (15.4%)

Physical activity

0

7 (53.9%)

Statins

1 (7.7%)

Physical activity and statins

1 (7.7%)

Other

2 (15.6%)

Failed screening/familiarisation

Apr 18

26

6740

15,046

2.23

13

11

2 (15.4%)

Physical activity

1 (7.7%)

2 (15.4%)

Statins

2 (15.4%)

No response

4 (30.8%)

Declined to take part

1 (7.7%)

Other

Jul 18

4

8244

8418

1.02

17

16

1 (5.9%)

Physical activity

0

7 (41.2%)

Statins

5 (29.4%)

No response

2 (11.8%)

Declined to take part

1 (5.9%)

Other

  1. Reach: number of people who saw the advert at least once during a single campaign (i.e. not cumulative over the campaigns). Impressions: the number of times that the advert was on screen. Frequency: the number of times that each person saw the advert