Table 1 Baseline headache status stability stratified on waves of study participation
Waves participated | Number of waves baseline headache status maintained | EM at Baseline, n (%)a; n = 15,313 | CM at Baseline, n (%)a; n = 1476 |
|---|---|---|---|
Respondents participating in 1 wave only (EM, n = 4801; CM, n = 474) | |||
1 | 1 | 4801 (100) | 474 (100) |
Respondents participating in any 2 waves (EM, n = 2839; CM, n = 270) | |||
2 | 1 | 99 (3.5) | 159 (58.9) |
2 | 2 | 2740 (96.5) | 111 (41.1) |
Respondents participating in any 3 waves (EM, n = 2209; CM, n = 206) | |||
3 | 1 | 29 (1.3) | 98 (47.6) |
3 | 2 | 98 (4.4) | 53 (25.7) |
3 | 3 | 2082 (94.3) | 55 (26.7) |
Respondents participating in any 4 waves (EM, n = 2161; CM, n = 206) | |||
4 | 1 | 12 (0.6) | 87 (42.9) |
4 | 2 | 31 (1.4) | 34 (16.7) |
4 | 3 | 106 (4.9) | 34 (16.7) |
4 | 4 | 2012 (93.1) | 48 (23.6) |
Respondents participating all 5 waves (EM, n = 3303; CM, n = 323) | |||
5 | 1 | 21 (0.6) | 101 (31.3) |
5 | 2 | 35 (1.1) | 43 (13.3) |
5 | 3 | 46 (1.4) | 32 (9.9) |
5 | 4 | 165 (5) | 55 (17) |
5 | 5 | 3036 (91.9) | 92 (28.5) |