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Table 2 Quality appraisal of included studies

From: Association between subthreshold depression and self-care behaviors in people with type 2 diabetes: a systematic review of observational studies

Study Cohort studyYesNoUnclearNot applicable
Dirmaier et al. [43]1.Were the two groups similar and recruited from the same population?X   
2.Were the exposures measured similarly to assign people to both exposed and unexposed groups?X   
3.Was the exposure measured in a valid and reliable way?X   
4.Were confounding factors identified?X   
5.Were strategies to deal with confounding factors stated?X   
6.Were the groups/participants free of the outcome at the start of the study (or at the moment of exposure)?   X
7.Were the outcomes measured in a valid and reliable way? X  
8.Was the follow-up time reported and sufficient to be long enough for outcomes to occur?X   
9.Was follow-up complete, and if not, were the reasons to loss to follow-up described and explored?  X 
10.Were strategies to address incomplete follow-up utilized?  X 
11.Was appropriate statistical analysis used?X   
Shin et al. [44]1.Were the criteria for inclusion in the sample clearly defined?X   
2.Were the study subjects and the setting described in detail?  X 
3.Was the exposure measured in a valid and reliable way?X   
4.Were objective, standard criteria used for measurement of the condition?X   
5.Were confounding factors identified?  X 
6.Were strategies to deal with confounding factors stated?X   
7.Were the outcomes measured in a valid and reliable way?X   
8.Was appropriate statistical analysis used?X