Association between Air Pollution and the Development of Rheumatic Disease: A Systematic Review

Table 3

Newcastle-Ottawa scale for quality of study assessment: case-control studies.

Case-control studies	Manuscript type	Adequate case definition	Representativeness of cases	Selection of controls	Definition of controls	Comparability of cases and controls	Ascertainment of exposure	Consistency ascertainment	Nonresponse rate	Total
De Roos, Canada, 2014 (RA)	Full
Hart, Sweden, 2013 (RA)	Full
Bernatsky, Alberta and Quebec, 2016 (SARD)	Full
Bernatsky, Calgary, 2015 (SARD)	Full
Zeft, US, 2009 (JIA)	Full				0
Zeft, US and Canada, 2014 (JIA)	Abstract			0	0			0	0

For case-control studies, quality was assessed for four domains of selection (case definition, representativeness of cases, selection of controls, and definition of controls), two domains of comparability (study controls for the most important factor and any additional important factor), and three domains of exposure (ascertainment of exposure, same method of ascertainment for cases and controls, and the nonresponse rate). Points are assigned based on specified levels of quality within each domain to a maximum of 9 points.
denotes the rating system used in the NOS scale.