Table 1.
Summary of samples and patients included in the study.
| Categories | Total (n = 1581) | Fondazione IRCCS Policlinico San Matteo (n = 1104) | University of Milan (n = 477) | |
|---|---|---|---|---|
| Gender (n = 1224) | Female | 315 (41.8%) | 239 (50.1%) | |
| Male | 432 (58.2%) | 238 (49.9%) | ||
| Age (n = 1224) | 0–4 years | 230 (18.8%) | 138 (18.4%) | 92 (19.3%) |
| 5–14 years | 201 (16.4%) | 76 (10.2%) | 125 (26.2%) | |
| 15–64 years | 562 (45.9%) | 333 (44.6%) | 229 (48.0%) | |
| ≥65 years | 231 (18.9%) | 200 (26.8%) | 31 (6.5%) | |
| ATSa | Città Metropolitana di Milano | 245 (15.5%)* | 113 (10.2%) | 132 (27.7%) |
| Insubria | 66 (4.2%) | 44 (4.0%) | 22 (4.6%) | |
| Brianza | 39 (2.5%) | 9 (0.8%) | 30 (6.3%) | |
| Bergamo | 78 (4.9%) | 8 (0.7%) | 70 (14.7%) | |
| Brescia | 92 (5.8%) | 2 (0.2%) | 90 (18.9%) | |
| Pavia | 912 (57.7%) | 912 (82.6%) | 0 (0%) | |
| Val Padana | 123 (7.8%) | 7 (0.6%) | 116 (24.3%) | |
| Montagna | 26 (1.6%) | 9 (0.8%) | 17 (3.5%) | |
| Period | October 2019 | 168 (10.6%) | 168 (15.2%) | 0 (0%) |
| November 2019 | 202 (12.8%) | 147 (13.3%) | 55 (11.5%) | |
| December 2019 | 231 (14.6%) | 161 (14.6%) | 70 (14.7%) | |
| January 2020 | 502 (31.8%) | 317 (28.7%) | 185 (38.8%) | |
| February 2020 | 478 (30.2%) | 311 (28.2%) | 167 (35.0%) | |
| Samples | Nasopharyngeal swab | 1382 (87.4%) | 905 (82.0%) | 477 (100.0%) |
| Pharyngeal swab | 13 (0.9%) | 13 (1.2%) | 0 (0%) | |
| Bronco aspirates | 7 (0.4%) | 7 (0.6%) | 0 (0%) | |
| Bronchoalveolar lavage | 179 (11.3%) | 179 (16.2%) | 0 (0%) | |
ATS, local health authorities ahttp://www.cartografia.regione.lombardia.it/metadata/ats/doc/Nuovo_Sistema_Socio_Sanitario_Lombardo.pdf).*16/245 (6.5%) samples were from Lodi.