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Forest plot representing the estimated sensitivity of studies on RT-qPCR analysis of salivary fluid for SARS-CoV-2 RNA, sub-analysis for cohort studies. Pooled sensitivity was 87.1% (95%CI 76.1–93.4), resulting from 87.2% (95%CI 70.3-95.1) for diachronous studies, and 89.1% (95%CI 77.8-95.0) for synchronous studies. Heterogeneity was substantial (I2, 60%), particularly both diachronous studies (I2 = 69%), while it was not calculated for synchronous studies as including a single report
