Table 1 Summary characteristics of the test and validation study populations
Variable | Level | Test sample, n (%) | Validation sample, n (%) |
|---|---|---|---|
Total sample | N | 349 (100%) | 715 (100%) |
Gender | Male | 61 (17.5%) | 120 (16.8%) |
Female | 285 (81.7%) | 595 (83.2%) | |
Other/Unknown | 3 (0.9%) | Â | |
Age group (years) | 18–25 | 41 (11.7%) | 61 (8.5%) |
26–35 | 66 (18.9%) | 109 (15.2%) | |
36–45 | 81 (23.2%) | 141 (19.7%) | |
46–55 | 81 (23.2%) | 187 (26.2%) | |
56–65 | 54 (15.5%) | 129 (18%) | |
66–75 | 21 (6%) | 70 (9.8%) | |
76–85 | 2 (0.6%) | 16 (2.2%) | |
86 +  |  | 2 (0.3%) | |
Unknown | 3 (0.9%) | Â | |
Ethnic group | White | 321 (92%) | 577 (80.7%) |
Black | 6 (1.7%) | 42 (5.9%) | |
Asian | 16 (4.6%) | 59 (8.3%) | |
Mixed | 2 (0.6%) | 21 (2.9%) | |
Unknown | 4 (1.1%) | 16 (2.2%) | |
Employment status | Employed | 207 (59.3%) | Â |
Unemployed | 6 (1.7%) | Â | |
At school | 12 (3.4%) | Â | |
Sickness | 68 (19.5%) | Â | |
Family | 12 (3.4%) | Â | |
Retired | 36 (10.3%) | Â | |
Unknown | 8 (2.3%) | Â | |
Age left school | None | Â | 4 (0.6%) |
Age 12 or less | 1 (0.3%) | 5 (0.7%) | |
Age 13 to 16 | 90 (25.8%) | 170 (23.8%) | |
Age 17 to 19 | 96 (27.5%) | 195 (27.3%) | |
Age 20 or over | 144 (41.3%) | 304 (42.5%) | |
Full time education | 13 (3.7%) | 27 (3.8%) | |
Unknown | 5 (1.4%) | 10 (1.4%) | |
How long headaches last | Minutes | 11 (3.2%) | Â |
Hours | 179 (51.3%) | Â | |
Never goes away | 153 (43.8%) | Â | |
Unknown | 6 (1.7%) | Â | |
Medication overuse | No | 40 (11.5%) | 316 (44.2%) |
Yes | 307 (88%) | 399 (55.8%) | |
Unknown | 2 (0.6%) | Â | |
Headache type | Definite Chronic Migraine | Â | 388 (54.3%) |
Probable Chronic Migraine | Â | 327 (45.7%) |