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Table 1 Baseline headache status stability stratified on waves of study participation

From: Fluctuations in episodic and chronic migraine status over the course of 1 year: implications for diagnosis, treatment and clinical trial design

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)
  1. CM chronic migraine, EM episodic migraine
  2. aPercentages are the percentages of the respondents participating in the identified number of waves