Likert scale of headache severity 0: no headache 1: I notice the headache only when I...

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Likert scale of headache severity 0: no headache 1: I notice the headache only when I pay attention to it 2: Mild headache that can be ignored at times 3: Headache is painful, but I can do my job or usual tasks 4: Very severe headache; I find it difficult to concentrate and can do only undemanding tasks 5: Intense, incapacitating headache Likert scale of headache severity 0: no headache 1: I notice the headache only when I pay attention to it 2: Mild headache that can be ignored at times 3: Headache is painful, but I can do my job or usual tasks 4: Very severe headache; I find it difficult to concentrate and can do only undemanding tasks 5: Intense, incapacitating headache