Epidemiology of Neuromyelitis Optica in the World: A Systematic Review and Meta-Analysis

Table 1

Quality assessment scores of multiple sclerosis incidence and prevalence studies.

Study (year)	Q1: target population described?	Q2: cases from entire population/probability sampling?	Q3: response rate >70%?	Q4: nonresponders clearly described?	Q5: sample representative of population?	Q6: data collection methods standardized?	Q7: validated criteria to assess disease?	Q8: were estimates given with confidence intervals?	Total score
Etemadifar et al. (2014) [9]	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	8/8
Pandit and Kundapur (2014) [13]	Yes	Yes	NR	Yes	Yes	No	Yes	No	5/8
Jacob et al. (2013) [10]	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	8/8
Houzen et al. (2012) [14]	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	8/8
Cossburn et al. (2012) [8]	Yes	Yes	NR	NA	Yes	Yes	Yes	Yes	6/7
Asgari et al. (2011) [7]	Yes	Yes	NR	NA	Yes	Yes	Yes	Yes	6/7
Cabrera-Gómez et al. (2009) [12]	Yes	Yes	NR	NA	Yes	Yes	Yes	Yes	6/7
Cabre et al. (2009) [11]	Yes	Yes	NR	NA	Yes	Yes	Yes	Yes	6/7
Rivera et al. (2008) [15]	Yes	NR	NR	NR	NR	No	Yes	No	2/8

NR: not reported; NA: not applicable; NC: not clear.