Total number of visits and mean number of daily visits by hospital, temporal and meteorological factors, and patient characteristics between 1 January 2014 and 31 December 2019 in five emergency departments of the city of Milan, Italy
| n (%)* | Mean (min–max)† | Cumulative precipitation (mm) | n (%)‡ | Mean (min–max)§ | |
| Hospitals | |||||
| A | 421 741 (19) | 192 (107–301) | ≤0.6 | 1 678 953 (75.5) | 1018 (563–1295) |
| B | 457 021 (20.6) | 209 (65–302) | 0.7+ | 544 526 (24.5) | 1005 (627–1392) |
| C | 272 308 (12.2) | 124 (61–197) | NO2 (μg/m3) | ||
| D | 530 519 (23.9) | 242 (125–337) | ≤32 | 564 957 (25.4) | 974 (563–1295) |
| E | 541 890 (24.4) | 247 (133–346) | 33–44 | 570 284 (25.6) | 1022 (723–1292) |
| Total | 2 223 479 | 1015 (563–1392) | 45–57 | 536 484 (24.1) | 1032 (698–1392) |
| Gender | 58+ | 551 754 (24.8) | 1035 (693–1272) | ||
| F | 1 113 405 (50.6) | 508 (277–782) | PM10 (μg/m3) | ||
| M | 1 087 903 (49.4) | 497 (277–661) | ≤20 | 571 339 (25.7) | 990 (563–1261) |
| Age | 21–29 | 575 530 (25.9) | 1017 (688–1295) | ||
| ≤14 | 360 600 (16.4) | 165 (55–443) | 30–44 | 544 147 (24.5) | 1023 (710–1392) |
| 15–65 | 1 307 139 (59.4) | 597 (317–860) | 45+ | 532 463 (23.9) | 1032 (693–1272) |
| 66+ | 533 569 (24.2) | 244 (141–385) | ILI (number of weekly new cases per 1000 inhabitants) | ||
| N (%)‡ | Mean (min–max)§ | ||||
| Temperature (°C) | ≤1.2 | 1 310 096 (58.9) | 1001 (563–1295) | ||
| ≤9.2 | 564 744 (25.4) | 1021 (693–1392) | 1.3–2.5 | 303 072 (13.6) | 1031 (799–1256) |
| 9.3–15.6 | 563 764 (25.4) | 1033 (813–1261) | 2.6–5.6 | 303 102 (13.6) | 1031 (698–1261) |
| 15.7–22.3 | 563 757 (25.4) | 1025 (656–1295) | 5.7+ | 307 209 (13.8) | 1045 (693–1392) |
| 22.4+ | 531 214 (23.9) | 980 (563–1292) | Day before/after festivity | ||
| Relative humidity (%) | No | 2 096 838 (94.3) | 1012 (563–1392) | ||
| ≤50 | 560 870 (25.2) | 1018 (563–1295) | Yes | 126 641 (5.7) | 1055 (688–1295) |
| 51–62 | 552 865 (24.9) | 1009 (637–1292) | Festivity | ||
| 63–76 | 554 041 (24.9) | 1017 (627–1392) | No | 2 144 726 (96.5) | 1018 (677–1392) |
| 77+ | 555 703 (25) | 1016 (786–1278) | Yes | 78 753 (3.5) | 938 (563–1253) |
*Total number of visits by hospital, gender and age. The percentages of the number of visits out of the total (2 223 479 total number of visits; 2 201 308 with information on age and gender) are in parentheses.
†Mean, minimum and maximum number of daily visits by hospital, gender and age.
‡Total number of visits by temporal and meteorological factors (ie, total number of visits in days with a particular value of temperature, humidity, etc). The percentages of the number of visits of the total (2 223 479 total number of visits) are in parentheses.
§Mean, minimum and maximum number of daily visits by temporal and meteorological factors (ie, mean number of daily visits in the days with a particular value of temperature, humidity, etc).
F, female; ILI, influenza-like illness; M, male; NO2, nitrogen dioxide; PM10, particulate matter with a diameter of ≤10 µm.