Musculoskeletal disorders in video gamers – a systematic review

Table 2 Risk of bias in individual studies

	Selection				Comparability	Outcome		Score
Study: first author (year)	1	2	3	4	5	6	7
Burke (2002) [41]			★	★	★★	★		5
DiFransiciso-Donoghue (2019) [37]					★			1
Hakala (2006) [38]	★	★	★	★	★★	★	★	8
Hellström (2015) [39]	★	★	★	★	★★	★	★	8
Kang (2003) [33]	★			★	★★	★	★	6
Lindberg (2020) [25]	★	★		★	★★	★	★	7
Ma (2019) [34]	★	★	★	★	★	★	★	7
Meziat-Filho (2017) [35]	★	★		★	★★	★	★	7
Sekiguchi (2018a) [42]	★	★		★	★★	★	★	7
Sekiguchi (2018b) [43]			★	★	★★	★	★	6
Silva (2016) [44]	★	★		★	★★	★	★	7
Tazawa (2001) [36]	★	★			★	★	★	5
Torsheim (2010) [40]	★	★		★★	★★	★	★	8
Wang (2019) [26]				★★		★★	★	5
Xavier (2015) [46]	★	★		★	★★	★	★	7
Yabe (2018) [45]	★	★		★	★★	★	★	7

1: Representativeness of the sample; 2: Justified and satisfactory sample size; 3: Non-respondents rate and characteristics; 4: Ascertainment of the exposure or risk factor (2 stars possible); 5: Comparability of groups based on study design or analysis (2 stars possible); 6: Assessment of the outcome (2 stars possible); 7: Statistical test description; Score: from 0 (low quality) to 10 stars (high quality)

ISSN: 1471-2474