The Egyptian Journal of Otolaryngology

Table 2 Critical appraisal of the literature using PROBAST [12]

From: Impaired olfaction post-coronavirus disease 2019: a systematic review of smell recovery predictive factors

Study	Risk of bias				Applicability			Overall
Study	Participants	Predictors	Outcome	Analysis	Participants	Predictors	Outcome	Risk of bias	Applicability
Amer et al. [14]	+	+	+	+	+	+	+	+	+
Babaei et al. [15]	+	+	+	+	+	+	–	+	+
Coelho et al. [16]	+	+	+	+	+	+	+	+	+
Ferreli et al. [17]	+	+	+	+	+	+	+	+	+
Teaima et al. [18]	+	+	+	+	+	+	+	+	+

PROBAST Prediction model Risk of Bias Assessment Tool
“ + ” indicates a low risk of bias/low concern regarding applicability; “–” indicates a high risk of bias/high concern regarding the applicability

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