Opinions of diaries by group
| Median (IQR) agreement (out of 8) | ||||
| Statement | SMS | Online | Paper | p Value |
| The diary was easy to complete | 7 (2) | 8 (0) | 8 (1.5) | 0.11 |
| I'm not sure I answered all the diary questions correctly | 1 (3) | 1 (5) | 1 (1) | 0.93 |
| I enjoyed completing the diary | 6 (2) | 7 (2) | 5.5 (3.5) | 0.053 |
| The diary was annoying to complete | 2 (4) | 2 (2) | 2 (2) | 0.27 |
| Each diary took a long time to complete | 1 (1) | 1 (0) | 1 (0.5) | 0.10 |
| I was sometimes uncertain about how to answer some questions | 1 (2) | 1 (0) | 1 (1) | 0.047* |
| I kept forgetting to fill out the diary | 2 (3) | 1 (4) | 3.5 (3) | 0.31 |
| I always completed the diary on time | 7 (5) | 6 (6) | 7 (1.5) | 0.60 |
| I filled the diary out every week I was supposed to | 8 (2) | 8 (0) | 8 (1) | 0.41 |
| I found it hard to remember what I had done over the past week | 2 (4) | 4 (3) | 2 (3) | 0.34 |
| The questions were embarrassing to answer | 1 (2) | 1 (1) | 1 (1) | 0.33 |
| I felt like my diary responses were boring | 5 (3) | 2 (5) | 5 (4.5) | 0.073 |
| I was worried that someone would find and read what I had written in the diary | 1 (1) | 1 (1) | 1 (3) | 0.079 |
| I always answered honestly | 8 (1) | 8 (0) | 8 (1) | 0.11 |
| I felt this research is important for young peoples' health | 8 (2) | 7 (3) | 8 (2) | 0.94 |
↵* Significant differences observed only between the SMS and online groups (p=0.01).