Many of our research participants were seen at two time points and a number of them have been seen at up to 5 time points. The table below describes the number of times participants were seen according to the disease category. We cannot, of course, guarantee that we have every type of sample for every participant at every time point available, but this gives you some guidance.
Definitions of disease categories can be found here.
| Participant Group | Visit 1 | Visit 2 | Visit 3 | Visit 4 | Visit 5 |
| Mild-Moderate ME/CFS | 244 | 125 | 36 | 11 | 8 |
| Severely affected ME/CFS | 87 | 68 | 42 | 33 | 28 |
| Multiple sclerosis | 68 | 47 | – | – | – |
| Healthy Controls | 130 | 84 | 10 | – | – |