Prevalence of familial cluster headache: a systematic review and meta-analysis

Table 3 Modified Newcastle-Ottawa Quality Assessment Scale for cohort studies with awarded stars per category

Study	Selection	Comparability	Outcome	Total number of stars
Kudrow and Kudrow (1994) [27]	★★★★	★★	★	7
Russell et al. (1996) [28]	★★★★	★	★	6
Montagna et al. (1998) [13]	★★★★	★	★	6
El Amrani et al. (2002) [29]	★★★★	★	★	6
Torelli and Manzoni (2003) [30]	★★★★	★★	★	7
Taga et al. (2015) [31]	★★★★	★	★	6
Leone et al. (2001) [14]	★★★★	★	★	6

A maximum of 7 stars can be awarded in total. Selection category = maximum of 4 stars. Comparability = maximum of 2 stars. Outcome = maximum of 1 star

ISSN: 1129-2377