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Table 3 RoB of case control studies in the qualitative synthesis based on the Joanna Briggs Institute Critical Appraisal Checklist

From: Allergies/asthma and root resorption: a systematic review

Questions—analytical case control studies

Melo et al. [15]

Nishioka et al. [11]

Owman-Moll et al. [17]

Pastro et al. [19]

Shim et al. [16]

1—Were the groups comparable other than the presence of disease in cases or the absence of disease in controls?

Y

Y

U

Y

Y

2—Were cases and control matched appropriately?

Y

Y

U

Y

Y

3—Were the same criteria used for identification of cases and controls?

Y

Y

Y

Y

Y

4—Was exposure measured in a standard, valid, and reliable way?

Y

Y

Y

Y

Y

5—Was exposure measured in the same way for cases and controls?

Y

U

Y

Y

Y

6—Were confounding factors identified?

U

Y

U

U

U

7—Were strategies to deal with confounding factors stated?

N

N

N

N

U

8—Were outcomes assessed in a standard, valid, and reliable way for cases and controls?

Y

N

Y

Y

N

9—Was the exposure period of interest long enough to be meaningful?

Y

Y

U

Y

Y

10—Was appropriate statistical analysis used?

Y

Y

U

Y

U

%Yes/risk

80.0

70.0

40.0

80.0

60.0

Overall

Low

Low

High

Low

Moderate

  1. Y yes, N no, U unclear, N.A not applicable