Table 1 Comparison of demographic characteristics of all patients with migraine in the United Kingdom and the United States identified during the initial screening and those who participated in the follow-up survey

CharacteristicsUKUS
All migraine, n = 571Participants, n = 143All migraine, n = 568Participants, n = 246
GCSE = General Certificate of Secondary Education; HND = Higher National Diploma.
Sex, %
    Men19.615.417.615.0
    Women80.484.682.485.0
Age, y, %
    16–2919.812.522.525.2
    30–3928.230.130.333.3
    40–4928.830.130.328.1
    50–6523.227.316.011.8
    Not stated0.00.00.91.6
Sex and age, %
    Men
        16–2917.318.223.024.3
        30–3931.831.832.035.1
        40–4936.527.329.032.4
        50–6514.422.716.08.1
        Not stated0.00.00.00.0
    Women
        16–2920.311.622.425.4
        30–3927.529.729.933.0
        40–4927.030.630.627.3
        50–6525.228.116.012.4
        Not stated0.00.01.11.9
Race, %
    White97.196.584.284.6
    Nonwhite2.22.814.114.6
    Not stated0.70.71.80.8
Highest education level, UK, %
    No examinations18.114.7
    “O”/GCSE37.337.7
    Technical training/HND or “A” level24.823.1
    University +13.818.2
    Not stated6.06.3
Highest education level, US, %
    <12 Grade8.510.2
    High school41.940.2
    Some college/2 y28.030.5
    College/4 y15.013.0
    Graduate school5.55.3
    Not stated1.20.8
Household income, UK, £, %
    Up to 10,00019.920.2
    10,000–24,99935.442.0
    25,000 or more21.923.8
    Not stated22.814.0
Household income, US, $, %
    ≤29,00021.025.6
    30,000–39,00011.112.2
    40,000–49,00010.211.8
    50,000+21.019.2
    Not stated36.831.3
Household size, %
    119.025.915.116.3
    233.929.432.932.9
    318.117.516.716.7
    4+18.814.024.121.5
    Not stated10.213.211.112.6