Skip to main content

Table 3 Quality assessment of case–control studies based on the JBI critical appraisal checklist

From: Association of Helicobacter pylori infection with the risk of metabolic syndrome and insulin resistance: an updated systematic review and meta-analysis

Studies Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9 Q10 Total Score
Gunji et al. (2008) [54] Y Y N N Y Y Y N Y Y 7
So et al. (2009) [55] Y Y Y Y Y Y Y N Y Y 9
Naja et al. (2012) [56] N Y N Y Y Y Y Y Y Y 8
Bajaj et al. (2014) [57] Y Y Y Y Y Y N N Y Y 8
Malamug et al. (2014) [58] Y Y Y N Y Y Y Y Y Y 9
Vafaeimanesh et al. (2014) [59] N Y N Y Y Y Y Y Y Y 8
Chen et al. (2015) [60] N Y Y Y Y Y Y N Y Y 8
Chen et al. (2015) [61] N Y Y N Y Y Y Y Y Y 8
Kayar et al. (2015) [42] Y Y N Y Y N N Y Y Y 7
Chen et al. (2016) [62] N Y Y Y Y Y Y N Y Y 8
Takeoka et al. (2016) [63] Y Y N Y Y Y Y Y Y Y 9
Alzahrani et al. (2017) [64] Y Y N Y Y Y Y Y Y Y 9
Allam et al. (2018) [65] N Y Y Y Y Y Y Y Y Y 9
Alshareef et al. (2018) [66] Y Y N Y Y Y Y N Y Y 8
Refaeli et al. (2018) [67] N Y N N Y Y Y Y Y Y 7
Chen et al. (2019) [68] N Y N N Y Y Y N Y Y 6
Lim et al. (2019) [69] N Y N Y Y Y Y N Y Y 7
Yu et al. (2019) [70] N Y N N Y Y Y Y Y Y 7
Q1: Were the groups comparable other than the presence of disease in cases or the absence of the disease in controls?
Q2: Were cases and controls matched appropriately?
Q3: Were the same criteria used for identification of cases and controls?
Q4: Was exposure measured in a standard, valid and reliable way?
Q5: Was exposure measured in the same way for cases and controls?
Q6: We’re confounding factors identified?
Q7: Were strategies to deal with confounding factors stated?
Q8: Were outcomes assessed in a standard, valid and reliable way for cases and controls?
Q9: Was the exposure period of interest long enough to be meaningful?
Q10: Was appropriate statistical analysis used?
  1. Y: Yes; N: No; UC: Unclear; NP: Not applicable