Introduction
Method
Participants and settings
Interventions
Outcomes
Before you accepted to join this trial you were given information about the trial procedure. We would like to ask you a few questions about this information
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I recall reading information about two groups, and that each group was going to be given access to either information or immediate access to a new mobile phone support tool.
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I recall reading information about two groups, but no details.
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I do not recall reading about allocation to two groups.
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I was given immediate access to information.
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I was given immediate access to a new mobile phone support tool.
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I do not know.
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How data would be stored in connection to my phone number.
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How my phone number would be encrypted when stored.
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My rights to the data according to GDPR.
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Who to contact in case I have a complaint regarding data handling.
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How phone numbers were going to be treated once the project is complete.
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That my data cannot be traced to my phone number after the project is complete.
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I do not recall reading about personal data.
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I recall reading about data analysis and communication of results, but no details.
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I recall reading about data analysis and communication of results, and some details of the analysis part.
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I recall reading about data analysis and communication of results, and some details of the communication part.
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I recall reading about data analysis and communication of results, and some details of both parts.
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I do not recall reading about data analysis nor communication of results.
Sample size
Randomization and blinding
Analysis
Result
One page (full group) n = 1046 | One page (responders)a n = 548 | Active request (full group) n = 1083 | Active request (responders)a n = 572 | |
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Total weekly consumption past week, median (IQR) | 17 (10; 25) | 17 (10; 24) | 16 (10; 25) | 15 (10; 25) |
Episodes of heavy drinking past month, median (IQR) | 6 (4; 12) | 6 (3;10) | 6 (4; 10) | 6 (4; 10) |
Age, median (IQR) | 45 (36; 54) | 48 (39; 56) | 45 (35; 54) | 47.5 (39; 56) |
Sex, n (%) | ||||
Female | 629 (60%) | 328 (60%) | 608 (56%) | 323 (56%) |
Male | 417 (40%) | 220 (40%) | 475 (44%) | 249 (44%) |
Household characteristics, n (%) | ||||
Living with somebody with kids | 363 (35%) | 198 (36%) | 393 (36%) | 227 (40%) |
Living with somebody without kids | 263 (25%) | 150 (27%) | 281 (26%) | 150 (26%) |
Living alone without kids at home | 221 (21%) | 100 (18%) | 222 (20%) | 97 (17%) |
Living alone with kids at home | 105 (10%) | 54 (10%) | 110 (10%) | 57 (10%) |
Have a partner but not living together | 94 (9%) | 46 (8%) | 77 (7%) | 41 (7%) |
Confidenceb, median (IQR) | 6 (5;8) | 7 (5;8) | 6 (5;8) | 6 (5;8) |
Importanceb, median (IQR) | 10 (9;10) | 10 (9;10) | 10 (9;10) | 10 (9;10) |
Knowledgeb, median (IQR) | 5 (3;7) | 5 (3;7) | 5 (2;6) | 5 (3;6) |
Intervention group in parent trialc, n (%) | 525 (50) | 248 (45) | 538 (50) | 282 (49) |
Recall of study groups and allocation
I have not received this information (control group participant)
I also remember being very disappointed not to be in the group who received support (control group participant)
Response | Total n (%) | One page n (%) | Active request n (%) |
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“Which one of these statements most accurately describes your recall of group allocation” | |||
I recall reading information about two groups, and that each group was going to be given access to either information or immediate access to a new mobile phone support tool. | 714 (64%) | 348 (64%) | 366 (64%) |
I recall reading information about two groups, but no details. | 187 (17%) | 93 (17%) | 94 (16%) |
I do not recall reading about allocation to two groups | 219 (20%) | 107 (20%) | 112 (20%) |
Chi-square test: χ2(2) = 0.06, p = 0.97 | |||
“Which one of the groups were you allocated to?” | |||
I was given immediate access to information | 527 (47%) | 266 (49%) | 261 (46%) |
I was given immediate access to a new mobile phone support tool | 293 (26%) | 134 (24%) | 159 (28%) |
I do not know | 298 (27%) | 147 (27%) | 151 (26%) |
Chi-squared test: χ2(2) = 1.72, p = 0.42 |
Response | Total n (%) | Control group n (%) | Intervention group n (%) |
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I was given immediate access to information | 527 (47%) | 377 (64%) | 150 (28%) |
I was given immediate access to a new mobile phone support tool | 293 (26%) | 29 (5%) | 264 (50%) |
I do not know | 298 (27%) | 181 (31%) | 117 (22%) |
Chi-squared test: χ2(2) = 297.9, p < .001 | |||
One page group | |||
I was given immediate access to information | 266 (49%) | 191 (64%) | 75 (30%) |
I was given immediate access to a new mobile phone support tool | 134 (24%) | 10 (3%) | 124 (50%) |
I do not know | 147 (27%) | 97 (33%) | 50 (20%) |
Chi-squared test: χ2(2) = 159.5, p < .001 | |||
Active request group | |||
I was given immediate access to information | 261 (46%) | 186 (64%) | 75 (27%) |
I was given immediate access to a new mobile phone support tool | 159 (28%) | 19 (7%) | 140 (50%) |
I do not know | 151 (26%) | 84 (29%) | 67 (24%) |
Chi-squared test: χ2(2) = 141.1, p < .001 |
Recall of handling of personal data
Total n (%) | One page n (%) | Active request n (%) | ||||
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Selected | Not selected | Selected | Not selected | Selected | Not selected | |
How data would be stored in connection to my phone number | 168 (15%) | 954 (85%) | 84 (15%) | 465 (85%) | 84 (15%) | 489 (85%) |
Chi-square test: χ2(1) = 0.09, p = 0.76 | ||||||
How my phone number would be encrypted when stored | 210 (19%) | 912 (81%) | 115 (21%) | 434 (79%) | 95 (17%) | 478 (83%) |
Chi-square test: χ2(1) = 3.52, p = 0.061 | ||||||
My rights to the data according to GDPR | 408 (36%) | 714 (64%) | 193 (35%) | 356 (65%) | 215 (38%) | 358 (62%) |
Chi-square test: χ2(1) = 0.68, p = 0.41 | ||||||
Who to contact in case I have a complaint regarding data handling | 80 (7%) | 1042 (93%) | 50 (9%) | 499 (91%) | 30 (5%) | 543 (95%) |
Chi-square test: χ2(1) = 6.35, p = 0.012 | ||||||
How phone numbers were going to be treated once the project is complete | 181 (16%) | 941 (84%) | 101 (18%) | 448 (82%) | 80 (14%) | 493 (86%) |
Chi-square test: χ2(1) = 4.08, p = 0.043 | ||||||
That my data cannot be traced to my phone number after the project is complete | 487 (43%) | 635 (57%) | 273 (50%) | 276 (50%) | 214 (37%) | 359 (63%) |
Chi-square test: χ2(1) = 19.49, p < 0.001 | ||||||
I do not recall reading about personal data | 394 (35%) | 728 (65%) | 166 (30%) | 383 (70%) | 228 (40%) | 345 (60%) |
Chi-square test: χ2(1) = 11.23, p < 0.001 |
Not a particularly important question (One page participant)
I’m not sure if I remember correctly, but I know I felt safe (One page participant)
I remember that contact would be anonymous (One page participant)
I remember that I made an evaluation based on the information and was satisfied, so do not remember any details (One page participant)
Recall of analysis and dissemination
This question is of no relevance to me. I am expecting that you follow research ethics. (One page participant)
I remember that everything would be anonymous. And nothing would be reported to any government authority? (One page participant)
Response | Total n (%) | One page n (%) | Active request n (%) |
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I recall reading about data analysis and communication of results, but no details | 384 (35%) | 189 (35%) | 195 (35%) |
I recall reading about data analysis and communication of results, and some details of the analysis part | 67 (6%) | 34 (6%) | 33 (6%) |
I recall reading about data analysis and communication of results, and some details of the communication part | 56 (5%) | 26 (5%) | 30 (5%) |
I recall reading about data analysis and communication of results, and some details of both parts | 127 (12%) | 64 (12%) | 63 (11%) |
I do not recall reading about data analysis nor communication of results. | 467 (42%) | 227 (42%) | 240 (43%) |
Chi-square test: χ2(4) = 0.36, p = 0.99 |
I did not read, I just wanted to get started. (Active request participant)
My focus was on reducing my alcohol consumption, I did not focus on the study design. (Active request participant)