Table 1 Cohort characteristics.

From: Hospital load and increased COVID-19 related mortality in Israel

   Time periods
Characteristic All I II III IV
Weeks (−8) to (−1) 0–6 7–13 14–18
Date of first hospitalization 15/07/2020–08/09/2020 09/09/2020–27/10/2020 28/10/2020–14/12/2020 15/12/2020–20/01/2021
No. (%) 22,636 (100.00) 5966 (26.36) 7418 (32.77) 2761 (12.20) 6491 (28.68)
Female, no. (%) 11,070 (48.90) 3082 (51.66) 3491 (47.06) 1362 (49.33) 3135 (48.30)
Age, mean (SD) y 59.79 (21.91) 56.71 (22.12) 59.71 (21.84) 60.48 (21.18) 62.44 (21.73)
Age, median y 63 60 63.5 64 66
Age group, no. (%) y:
 <20 (%) 958 (4.23) 311 (5.21) 309 (4.17) 110 (3.98) 228 (3.51)
 20–29 (%) 1620 (7.16) 511 (8.57) 541 (7.29) 180 (6.52) 388 (5.98)
 30–39 (%) 1849 (8.17) 540 (9.05) 634 (8.55) 206 (7.46) 469 (7.23)
 40–49 (%) 2308 (10.20) 732 (12.27) 748 (10.08) 268 (9.71) 560 (8.63)
 50–59 (%) 3079 (13.60) 869 (14.57) 978 (13.18) 400 (14.49) 832 (12.82)
 60–69 (%) 4142 (18.30) 1096 (18.37) 1391 (18.75) 512 (18.54) 1143 (17.61)
 70–79 (%) 4097 (18.10) 952 (15.96) 1325 (17.86) 549 (19.88) 1271 (19.58)
 80+ (%) 4583 (20.25) 955 (16.01) 1492 (20.11) 536 (19.41) 1600 (24.65)
Initial clinical state at hospitalization, no. (%):
 Mild (%) 13,508 (59.67) 3885 (65.12) 4760 (64.17) 1502 (54.40) 3361 (51.78)
 Moderate (%) 3600 (15.90) 1011 (16.95) 1034 (13.94) 452 (16.37) 1103 (16.99)
 Severe (%) 4967 (21.94) 976 (16.36) 1441 (19.43) 724 (26.22) 1826 (28.13)
 Critical (%) 561 (2.48) 94 (1.58) 183 (2.47) 83 (3.01) 201 (3.10)
Deaths within the prediction period, from hospitalization date, no. (%):
 7 days (%) 1009 (4.46) 165 (2.77) 369 (4.97) 111 (4.02) 364 (5.61%)
 14 days (%) 1994 (8.81) 359 (6.02) 715 (9.64) 242 (8.76)
 21 days (%) 2532 (11.19) 503 (8.43) 919 (12.39) 323 (11.70)
 28 days (%) 2786 (12.31) 592 (9.92) 1007 (13.58) 371 (13.44)
  1. Time periods were divided by the maximum daily number of severe and critical patients during the week: in time-periods I and III <500, and in time-periods II and IV >500.