Number of participants (as a percentage of total N) for whom a specific number of 3-month periods of data were available
| No of 3-month periods for which data were available | Questionnaire data on outcome (N=1951) | Original recorded computer data (N=1951) | Total recorded computer data (original and imputed data) (N=1951) | Imputed recorded computer data (as a percentage of the total no of participants with recorded computer data, ie, N=1009) |
| 9 (ie, for all nine periods data available) | 1013 (52%) | 0 (0%) | 0 (0%) | 0 (0%) |
| 8 (ie, for one period data missing) | 266 (14%) | 2 (0%) | 2 (0%) | 0 (0%) |
| 7 | 141 (7%) | 31 (2%) | 158 (8%) | 0 (0%) |
| 6 | 101 (5%) | 44 (2%) | 121 (6%) | 0 (0%) |
| 5 | 66 (3%) | 55 (3%) | 187 (10%) | 10 (1%) |
| 4 | 132 (7%) | 218 (11%) | 144 (7%) | 21 (2%) |
| 3 | 80 (4%) | 156 (8%) | 106 (5%) | 306 (30%) |
| 2 | 78 (4%) | 308 (16%) | 166 (9%) | 33 (3%) |
| 1 | 74 (4%) | 195 (10%) | 125 (6%) | 93 (9%) |
| 0 (ie, no data available) | 942 (48%) | 942 (48%) | 546 (54%) |