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. 2021 Jun 16;125(5):658–671. doi: 10.1038/s41416-021-01452-4

Fig. 1. Study flowchart.

Fig. 1

COVID-19 diagnosis was positive based on positive RT-PCR results (*RT-PCR+), OR specific radiological signs of COVID-19 on chest CT scan (**CT scan+). COVID-19 diagnosis was negative if RT-PCR result was negative AND (i) no specific radiological signs of COVID-19 on chest CT scan; (ii) no chest CT scan performed. A failure for COVID-19 diagnosis is reported in the absence of RT-PCR test and no evidence of COVID-19 radiological signs on chest CT scan. ± Non-exclusive reasons.