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Table 2 Patient characteristics stratified by headache days per month

From: Economic consequences of migraine in Sweden and implications for the cost-effectiveness of onabotulinumtoxinA (Botox) for chronic migraine in Sweden and Norway

Headache days per month N Age, mean (SD) % Female
0–4 headache days 99 53.47 (11.53) 90.91
5–9 headache days 138 50.40 (11.07) 92.75
10–14 headache days 80 51.28 (11.51) 86.25
15–24 headache days 74 47.55 (11.27) 87.84
25–31 headache days 63 48.90 (13.30) 84.13
  1. Key: SD Standard Deviation