Table 2.
Characteristics of studies reported about (n = 47)
| Type of participants in diary studies | Only healthy participants | 21 (45%) |
| With somatic symptoms | 8 (17%) | |
| With psychiatric symptoms | 17 (36%) | |
| With somatic and psychiatric symptoms | 1 (2%) | |
| Momentary or retrospective | Momentary | 14 (30%) |
| Retrospective | 12 (25%) | |
| Both | 21 (45%) | |
| Fixed or random assessment | Fixed | 24 (52%) |
| Random | 11 (24%) | |
| Semi-random | 10 (22%) | |
| Fixed and random | 1 (2%) | |
| Use study design again | Yes | 27 (60%) |
| No | 17 (40%) | |
| Median (Interquartile range) | Mode (Range) | |
| Study duration (days) | 17 (7, 30) | 14 (1, 270) |
| Measurement frequency (times/day) | 5 (3, 10) | 10 (1, 50) |
| Delay allowed to respond (minutes) | 30 (15, 60) | 60 (1.5, 1440) |
| Number of items in the dairya | 30 (19, 55) | 5, 25, and 50 (5, 90) |
aAssessed during the second round, based upon answers on 35 studies reported by 38 participating researchers