Corrigendum

In (1), in Table 1, the information in the “Collaborative Group, 1975 (79)” row and the “Marini, 1993 (80)” row was incomplete, and the information in the second column of the “Lidegaard, 1995 (8)” row and the last column of the “Haapaniemi, 1997 (81)” row was incorrect. The corrected version of Table 1 is reproduced below:

Table 1

Multivariable-adjusted∗ relative risks of ischemic stroke according to migraine status

Study (reference)	Migraine status			Age range of study participants at study entry (years)	Gender
	Overall	With aura	Without aura
	RR (95% CI)	RR (95% CI)	RR (95% CI)
Prospective studies†
Buring, 1995 (13)	2.00 (1.10–3.64)	–	–	40–84	Men
Nightingale, 2004 (78)	2.33 (1.04–5.21)	–	–	15–49	Women
Hall, 2004 (36)	1.52 (1.29–1.78)	–	–	Any	Men and women
Velentgas, 2004 (37)	1.67 (1.31–2.13)	–	–	Any	Men and women
Kurth, 2005 (14)	1.36 (0.97–1.92)	1.73 (1.10–2.71)	1.11 (0.69–1.78)	≥45	Women
Stang, 2005 (15)	–	2.07 (0.96–4.44)	0.86 (0.37–2.00)	45–64	Men and women
Retrospective studies‡
Collaborative Group, 1975 (79)	2.00 (1.2–3.3)	–	–	15–44	Women
Heinrich, 1989 (3)	1.8 (0.9–3.6)	2.6 (1.1–6.6)	1.3 (0.5–3.6)	15–65	Men and women
Marini, 1993 (80)	1.91 (1.05–3.5)	14.85 (1.8–124)	1.6 (0.9–3.0)	15–44	Men and women
Tzourio, 1993 (4)	1.3 (0.8–2.3)	1.3 (0.5–3.8)	0.8 (0.4–1.5)	18–80	Men and women
Tzourio, 1995 (6)	3.5 (1.8–6.4)	6.2 (2.1–18.0)	3.0 (1.5–5.8)	18–44	Women
Lidegaard, 1995 (8)	2.8 (2.1–4.25)			15–44	Women
Carolei, 1996 (5)	1.3 (0.7–2.4)	8.6 (1.0–75.0)	1.0 (0.5–2.0)	15–44	Men and women
Haapaniemi, 1997 (81)	2.12 (1.05–2.95)	–	–	16–60	Men§
Chang, 1999 (7)	3.54 (1.30–9.61)	3.81 (1.26–11.5)	2.97 (0.66–13.5)	20–44	Women
Donaghy, 2002 (10)	–	8.37 (2.33–30.1)	2.21 (0.49–10.1)	20–44	Women
Schwaag, 2003 (11)	2.11 (1.16–3.82)	–	–	15–45	Men and women
Stang, 2005 (15)	–	5.46 (3.64–8.18)	2.45 (1.66–3.60)	45–64	Men and women
MacClellan, 2007 (12)	–	1.3 (0.9–1.8)	1.0 (0.6–1.5)	15–49	Women

RR denotes relative risk

CI denotes confidence interval

∗

Presented are the relative risks of the fully adjusted multivariable model in cases when several multivariable models were presented

†

Prospective indicates migraine assessment prior to the occurrence of a stroke event

‡

Retrospective indicates that migraine was assessed after a stroke event occurred

§

Study included also women but a relative risk for the entire study and women was not shown