Table 1.

Demographic characteristics of patient groups using and not using migraine preventive treatments

Patient characteristic (ITT population)	Using preventive treatments N = 698	Not using preventive treatments N = 3283
Age, mean (SD), years	45.7 (11.6)‡	41.4 (12.5)
Female, n (%)	613 (87.8)†	2742 (83.5)
Race, white, n (%)	595 (85.2)‡	2560 (78.0)
BMI, mean (SD)	30.3 (7.3)	30.2 (8.8)
Duration of migraine history, mean (SD), years	21.4 (13.8)‡	18.1 (12.6)
Average migraine attacks/month in past 3 months, mean (SD)	5.3 (1.8)	5.2 (1.9)

BMI body-mass index, ITT intent to treat, N number of patients in subgroup of ITT population, n number of patients with stated characteristic, SD standard deviation

^†p < 0.05; ^‡p < 0.001 compared with not using preventives