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Table 2 Participant engagement, dose delivered, frequency, timing and difficulties experienced of TXT2BFiT program components by intervention groups

From: Process evaluation of TXT2BFiT: a multi-component mHealth randomised controlled trial to prevent weight gain in young adults

Program component Intervention Control
  Post intervention 3-monthsa Follow-up 9-monthsa Post intervention 3-monthsa Follow-up 9-monthsa
Coaching calls
Dose and engagement
 Completed, % (n) 91.8 (574/625) 81.3 (187/230) 100 (125/125)b n/a
Text messages
Dose
 Delivered, % (n) 97.8 (11543/11808) 95.7 (660/690) 97.0 (485/500) n/a
Engagement
 Replying to ≥ 50 %, % (n) 52.8 (66/123)c 40.0 (46/115)d 91.2 (114/125)e n/a
 Replying to all, % (n) 20.3 (25/123) 6.1 (7/115) 62.4 (78/125) n/a
Frequency (sent often enough) % (n) 95.5 (105/110) 75.0 (72/96) n/a n/a
Timing (suitable), % (n) 93.6 (103/110) n/a n/a n/a
Difficulties, % (n) 8.2 (9/110) 4.2 (4/96) 1.9 (2/104) n/a
Emails
Dose
 Delivered, % (n) 100 (1476/1476) 100 (690/690) n/a n/a
Frequency (sent often enough), % (n) 92.7 (102/110) 71.9 (69/96) n/a n/a
Timing (suitable), % (n) 96.4 (106/110) n/a n/a n/a
Difficulties, % (n) 3.6 (4/110) 3.1 (3/96) n/a n/a
Smartphone applicationsf
Dose and engagement
 Downloads, % (n)
  ePASS 52.0 (64/123)   n/a n/a
  eSIYP 30.9 (38/123)   n/a n/a
  eVIP 43.1 (53/123)   n/a n/a
 Logins, n (median, range)
  ePASSg 327 (3, 1–39)   n/a n/a
  eSIYPh 128 (2, 1–28)   n/a n/a
  eVIPi 219 (2, 1–39)   n/a n/a
Difficulties 28.2 (31/110) 19.8 (19/96) n/a n/a
Website
Engagement
 Community blog posts by staff, n 10   n/a n/a
 Community blog posts by participants, n 8   n/a n/a
Difficulties, % (n) 7.3 (8/110) 3.1 (3/96) 2.9 (3/104) n/a
  1. a110 intervention and 104 control participants completed the 3-month post-intervention survey and 96 intervention and 104 control participants completed the 9-month follow-up survey
  2. bIntroductory phone call only, no coaching given
  3. creplying to ≥ 8 text messages
  4. dreplying to ≥ 3 text messages
  5. ereplying to ≥ 2 text messages
  6. fData for smartphone application eTIYP (take-out food app) was lost due to a change in server by external provider during the RCT
  7. gePASS, physical activity app
  8. heSIYP, sugar-sweetened drinks app
  9. ieVIP, fruit and vegetable app