TABLE 5.

Known‐groups validity at baseline: Average number of month migraine days, episodic migraine

	N (total)	Average number of migraine days								F	p‐value	p‐value for pairwise comparisons a
		4–5		6–7		8–9		10–14
		N	LS mean (SE)	N	LS mean (SE)	N	LS mean (SE)	N	LS mean (SE)
PDA domain	128	37	9.7 (1.8)	15	13.9 (2.8)	37	16.3 (1.8)	39	20.8 (1.8)	4.03	0.002	1 vs. 2: 0.663
												1 vs. 3: 0.089
												1 vs. 4: <0.001
												2 vs. 3: 0.919
												2 vs. 4: 0.243
												3 vs. 4: 0.373
PI domain	128	37	6.1 (1.7)	15	9.8 (2.7)	37	11.6 (1.7)	39	15.8 (1.7)	3.53	0.005	1 vs. 2: 0.719
												1 vs. 3: 0.176
												1 vs. 4: 0.002
												2 vs. 3: 0.960
												2 vs. 4: 0.322
												3 vs. 4: 0.385
AIM‐D total score	128	37	8.3 (1.7)	15	12.4 (2.7)	37	14.2 (1.7)	39	18.8 (1.7)	3.93	0.002	1 vs. 2: 0.653
												1 vs. 3: 0.120
												1 vs. 4: <0.001
												2 vs. 3: 0.953
												2 vs. 4: 0.260
												3 vs. 4: 0.317

Bolded values correspond to p less than or equal to 0.05.

Abbreviations: AIM‐D, Activity Impairment in Migraine Diary; LS, least squares; SE, standard error.

^a Scheffe's test.