Disability-adjusted life years (DALYs) based COVID-19 health impact assessment: a systematic review

BMC Public Health

Table 2 Included studies’ risk of bias assessment results

Studies	Assessment questions/checklist								Overall appraisal
Studies	Q1. Were the criteria for inclusion in the sample clearly defined?	Q2. Were the study subjects and the setting described in detail?	Q3. Was the exposure measured in a valid and reliable way?	Q4. Were objective, standard criteria used for measurement of the condition?	Q5. Were confounding factors identified?	Q6. Were strategies to deal with confounding factors stated?	Q7. Were the outcomes measured in a valid and reliable way?	Q8. Was appropriate statistical analysis used?	Overall appraisal
Cuschieri et al. [9]	Yes	Yes	No	Yes	No	No	Yes	Yes	IN
Fan et al. [11]	Yes	Yes	No	Yes	No	No	Yes	Yes	IN
Oh et al. [12]	Yes	Yes	No	No	No	No	No	Yes	IN
Wyper et al. [13]	Yes	Yes	No	Yes	Yes	Yes	Yes	Yes	IN
Islam et al. [14]	Yes	Yes	No	No	Yes	No	No	Yes	IN
Pifarre et al. [15]	Yes	Yes	No	No	Yes	No	No	Yes	IN
Ugarte et al. [16]	Yes	Yes	No	No	Yes	No	No	Yes	IN
Rommel et al. [18]	Yes	Yes	No	Yes	Yes	No	Yes	Yes	IN
Gianino et al. [19]	Yes	Yes	No	Yes	No	No	Yes	Yes	IN
Salinas-Escudero et al. [20]	Yes	Yes	No	Yes	Yes	No	Yes	Yes	IN
Singh et al. [21]	Yes	Yes	Yes	Yes	Yes	No	Yes	Yes	IN
Jo et al. [22]	Yes	Yes	Yes	Yes	No	No	Yes	Yes	IN

Answer alternatives for each item are: Yes, No, Unclear, Not Applicable (N/A)
Overall appraisal alternatives are include (IN), exclude (EX), seek further information (SFI), Q stands for “question”

ISSN: 1471-2458