Table 1

Sociodemographic characteristics and disease severity, median number of nasopharyngeal swabs per subject with RT-PCR assay for SARS-CoV-2, number (and proportion) of subjects with at least one negative nasopharyngeal swab and number (and proportion) of these subjects who received viral clearance confirmation on retesting in the cohort of subjects resident in the province of Reggio Emilia and diagnosed with COVID-19 before 22 March 2020 and followed up until 22 April 2020

Overall sample tested N (%)Total swabs per subjectFirst negative swabConfirmed negative swab
(median, range)N negative (%)N° confirmed /
N° retested (%)
Total 1162 3 (1–9) 704 (60.6) 436/554 (78.7)
Deaths
of which death before start of follow-up
172 (14.8)
110
Sex
 M652 (56.1)3 (1–8)394 (60.4)257/321 (80.1)
 F510 (43.9)3 (1–9)310 (60.8)179/233 (76.8)
Age
Mean (SD)
60.7 (16.3)
Age categories
 <50303 (26.1)4 (1–8)215 (71.0)147/176 (83.5)
 50–59258 (22.2)3 (1–8)184 (71.3)113/151 (74.8)
 60–69229 (19.7)3 (1–9)154 (67.2)89/120 (74.2)
 70–79193 (16.6)3 (1–8)98 (50.8)57/72 (79.2)
 ≥80179 (15.4)2 (1–7)53 (29.6)30/35 (85.7)
Citizenship
 Italian1108 (95.4)3 (1–9)667 (60.2)418/530 (78.9)
 Foreign54 (4.6)3 (1–7)37 (68.5)18/24 (75.0)
Disease severity
 No access to Emergency Department or hospital353 (30.4)4 (1–9)271 (76.8)174/223 (78.2)
 Emergency Department use only232 (20.0)3 (1–7)155 (66.8)96/124 (77.4)
 Hospitalisation*577 (49.6)3 (1–8)278 (48.2)166/207 (80.2)
  • *Hospitalisation excluding patients using Emergency Department only AND patients with no hospitalisation and no Emergency Department use.

  • ED, Emergency Department.