Table 1. Baseline Characteristics of the Study Groups.
| Characteristic | Participants, No. (%) | ||
|---|---|---|---|
| 2 Doses only (n = 2529)a | 3 Doses (n = 16 082)b | Overall (N = 18 611) | |
| Sex | |||
| Female | 1640 (64.8) | 11 075 (68.9) | 12 715 (68.3) |
| Male | 884 (35.0) | 4966 (30.9) | 5850 (31.4) |
| Missing | 5 (0.2) | 41 (0.3) | 46 (0.2) |
| Age, y | |||
| Mean (SD) | 79.3 (10.1) | 81.4 (9.0) | 81.1 (9.2) |
| Median (IQR) | 80.0 (15.0) | 83.0 (13.0) | 83.0 (14.0) |
| Range | 60-121 | 60-121 | 60-121 |
| Community socioeconomic status rank | |||
| Low | 575 (22.7) | 2912 (18.1) | 3487 (18.7) |
| Medium | 1084 (42.9) | 5719 (35.6) | 6803 (36.6) |
| High | 734 (29.0) | 6991 (43.5) | 7725 (41.5) |
| Missing | 136 (5.4) | 460 (2.9) | 596 (3.2) |
| Population group | |||
| Arab population | 130 (5.1) | 333 (2.1) | 463 (2.5) |
| General Jewish population | 2120 (83.8) | 14 856 (92.4) | 16 976 (91.2) |
| Ultraorthodox Jewish population | 159 (6.3) | 459 (2.9) | 618 (3.3) |
| Missing | 120 (4.7) | 434 (2.7) | 554 (3.0) |
| Starting follow-up epidemiological week | |||
| Mean (SD) | 34.4 (0.9) | 33.8 (0.8) | 33.9 (0.9) |
| Median (IQR) | 35.0 (1.0) | 34.0 (1.0) | 34.0 (2.0) |
| Range | 32.0-37.0 | 32.0-36.0 | 32.0-37.0 |
| Uptake of the third dose per facility, % | |||
| 0-59 | 1275 (50.4) | 1902 (11.8) | 3177 (17.1) |
| 60-69 | 490 (19.4) | 2988 (18.6) | 3478 (18.7) |
| 70-79 | 529 (20.9) | 7620 (47.4) | 8149 (43.8) |
| 80-100 | 235 (9.3) | 3572 (22.2) | 3807 (20.5) |
| Facility typec | |||
| Mental health | 49 (1.9) | 168 (1.0) | 217 (1.2) |
| Geriatric facilities | 1831 (72.4) | 9766 (60.7) | 11 597 (62.3) |
| Elder day care facilities | 52 (2.1) | 354 (2.2) | 406 (2.2) |
| Welfare statutory accommodation (independent) | 203 (8.0) | 3758 (23.4) | 3961 (21.3) |
| Welfare nursing homes (mentally frail) | 113 (4.5) | 856 (5.3) | 969 (5.2) |
| Welfare disabilities | 46 (1.8) | 596 (3.7) | 642 (3.4) |
| Other | 235 (9.3) | 584 (3.6) | 819 (4.4) |
a
Two doses of BNT162b2 vaccine at least 5 months before starting the follow-up date.
b
Received a third dose at least 5 months after vaccination with the second BNT162b2 vaccine dose.
c
The facilities that were classified as welfare disabilities include residents with physical or cognitive disabilities. The welfare nursing homes include residents that need some help and supervision in performing activities of daily living. Welfare statutory accommodation usually serves residents who are independent and capable of performing activities of daily living. Elder day-care facilities serve residents with variable functional status who live in their own homes, but they are transported to these facilities 2 to 3 times per week.