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Table 1 Results of the critical appraisal of the included studies

From: Are healthcare workers’ intentions to vaccinate related to their knowledge, beliefs and attitudes? a systematic review

Study (first author)

Study design

Selection

Comparability

Outcome

  

Representativeness of the sample

Sample size

Non-respondents

Ascertainment of exposure

Based on design and analysis

Assessment of outcome

Statistical test

Gonik et al. (2000) [19]

Cross-sectional

+

  

+

 

+

 

Schupfner et al. (2002) [20]

Cross-sectional

+

+

 

+

++

+

+

Taylor et al. (2002) [21]

Cross-sectional

   

+

++

++

+

Zimmerman et al. (2002) [22]

Cross-sectional

+

 

+

+

++

+

+

Davis et al. (2003) [23]

Cross-sectional

+

 

+

+

++

+

+

Milledge et al. (2003) [24]

Cross-sectional

+

+

+

+

++

+

+

Jungbauer-Gans et al. (2003) 1st part [25]

Cross-sectional

+

  

+

 

+

+

Jungbauer-Gans et al. (2003) 2nd part [25]

Cross-sectional

+

  

+

 

++

+

Wilson et al. (2004) [26]

Cross-sectional

+

+

+

+

++

+

+

Russell et al. (2004) [27]

Cross-sectional

+

+

+

+

++

+

+

Petousis-Harris et al. (2005) [28]

Cross-sectional

+

+

 

+

 

+

 

Clark et al. (2006) [29]

Cross-sectional

+

  

+

 

+

 

Davis et al. (2007) [30]

Cross-sectional

+

+

 

+

 

+

+

Gust et al. (2008) [31]

Cross-sectional

+

  

+

++

+

+

Goodyear-Smith et al. (2009) [32]

Cross-sectional

+

+

+

+

++

++

+

Study (first author)

Study design

Selection

   

Comparability

Exposure

Case definition adequate?

Representativeness of the cases

Selection of controls

Definition of controls

Based on design and analysis

Ascertainment of exposure

Same method for cases and controls

Non-response rate

Salmon et al. (2008) [33]

Case–control

+

+

+

+

+

 

+