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Table 2 Risk of bias of the included studies

From: Adherence to Mediterranean diet associated with health-related quality of life in children and adolescents: a systematic review

Author, publication year Study design Selection Comparability Outcome Score Interpretation
Representativeness of the sample Sample size Nonrespondents Ascertainment of exposure Based on design and analysis Assessment of outcome Statistical test
Costarelli et al., 2012 [14] Cross-sectional    +     +  +   +   +    5 High risk of bias
Muros et al., 2016 [15] Cross-sectional  +   +     +  +   +  +   +    7 Low risk of bias
Zervaki et al., 2017 [16] Cross-sectional      +  +   +   +    4 High risk of bias
Evaristo et al., 2018 [17] Cross-sectional  +   +   +   +  +   +  +   +   +  9 Low risk of bias
Esteban-Gonzalo et al., 2019* [18] Cross-sectional      +  +   +   +   +  5 High risk of bias
Ferrer-Cascales et al., 2019 [19] Cross-sectional  +   +   +   +  +   +  +   +    8 Low risk of bias
Delgado-Floody et al., 2020 [20] Cross-sectional  +      +  +   +   +   +  6 High risk of bias
Rodriguez-Rosado et al., 2020 [21] Cross-sectional      +  +   +   +    4 High risk of bias
Caamaño-Navarrete et al., 2021 [22] Cross-sectional    +   +   +  +   +   +   +  7 Low risk of bias
Mitri et al., 2021 [23] Cross-sectional  +   +     +  +   +   +    6 High risk of bias
Mozzillo et al., 2021 [24] Cross-sectional  +      +  +   +   +   +  6 High risk of bias
  1. *Originally a longitudinal study, it was considered the baseline cross-sectional cohort