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Headache frequency before pandemic (T0), during first pandemic phase (T1), and during second pandemic phase (T2). Results of repeated measures ANOVA with: (a) migraine diagnosis at baseline (episodic migraine, EM; chronic migraine, CM) as factor F: 24.49 p < 0.0001; degree of freedom 2; degree of error: 301; ** T0 vs. T2, T1 vs. T2 p < 0.01; (b) subjective judgment of outcome as factor: F 22.61 p <0.0001; degree of freedom 4; degree of error 602; ** T0 vs. T2 and T1 vs. T2 p < 0.01.
