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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 + + + + +   +  
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