Studies | ➀ | ➁ | ➂ | ➃ | ➄ | ➅ | ➆ | ➇ |
Wang et al, 202133 | Y | Y | Y | Y | Y | Y | Y | Y |
Zhou et al, 202026 | Y | Y | Y | Y | Y | N | Y | Y |
Cui et al, 201928 | Y | Y | Y | Y | Y | Y | Y | Y |
Li et al, 201827 | Y | Y | Y | Y | N | N | UC | Y |
Cheng et al, 201831 | Y | Y | Y | Y | Y | UC | Y | Y |
Miao et al, 201621 | Y | Y | N | N | N | N | UC | Y |
Zhao et al, 201530 | Y | N | Y | Y | N | UC | Y | Y |
Cui et al, 20148 | Y | Y | Y | Y | Y | NA | Y | Y |
Liu et al, 201229 | NA | Y | N | Y | N | N | N | Y |
Y, yes; N, no; UC, unclear; NA, not applicable
➀Were the criteria for inclusion in the sample clearly defined?
➁Were the study subjects and the setting described in detail?
➂Was the exposure measured in a valid and reliable way?
➃Were objective, standard criteria used for measurement of the condition?
➄Were confounding factors identified?
➅Were strategies to deal with confounding factors stated?
➆Were the outcomes measured in a valid and reliable way?
➇Was appropriate statistical analysis used?