Table 1 Characteristics of the dynamic study population stratified by year; randomly selecting one observation each year for each unique patient
| Â | Â | 2019 | 2020 | 2021 | |||
|---|---|---|---|---|---|---|---|
n | % | n | % | n | % | ||
| Â | Unique patients | 23,659,872 | Â | 24,030,782 | Â | 24,207,653 | Â |
| Â | Unique practices | 2535 | Â | 2537 | Â | 2539 | Â |
Age | Mean (SD) | 41.3 | (23.4) | 41.4 | (23.4) | 41.6 | (23.4) |
Sex | Female | 11,829,112 | (50.0) | 12,011,148 | (50.0) | 12,094,492 | (50.0) |
Male | 11,830,760 | (50.0) | 12,019,634 | (50.0) | 12,113,161 | (50.0) | |
BMI (kg/m2) | Mean (SD) | 27.6 | (5.8) | 27.5 | (5.80) | 27.6 | (5.8) |
Ethnicity | White | 13,439,396 | (56.8) | 13,541,062 | (56.3) | 13,564,572 | (56.0) |
Black | 341,080 | (1.4) | 357,780 | (1.5) | 369,575 | (1.5) | |
Mixed | 8,187,236 | (34.6) | 8,355,263 | (34.8) | 8,434,622 | (34.8) | |
Other | 1,005,709 | (4.3) | 1,049,971 | (4.4) | 1,083,398 | (4.5) | |
South Asian | 272,869 | (1.2) | 290,543 | (1.2) | 305,350 | (1.3) | |
Unknown | 413,582 | (1.7) | 436,163 | (1.8) | 450,136 | (1.9) | |
Charlson comorbidity score | zero | 18,952,331 | (80.1) | 19,301,181 | (80.3) | 19,496,322 | (80.5) |
low (1–2) | 3,870,088 | (16.4) | 3,898,292 | (16.2) | 3,890,479 | (16.1) | |
medium (3–4) | 664,115 | (2.8) | 660,544 | (2.7) | 653,275 | (2.7) | |
high (5–6) | 125,260 | (0.5) | 122,069 | (0.5) | 118,360 | (0.5) | |
very high (7 +) | 48,078 | (0.2) | 48,696 | (0.2) | 49,217 | (0.2) | |
Index of multiple deprivation (IMD) category | 1 – most deprived | 4,728,480 | (20.0) | 4,791,698 | (19.9) | 4,806,148 | (19.9) |
2 | 4,639,138 | (19.6) | 4,706,657 | (19.6) | 4,720,798 | (19.5) | |
3 | 4,942,308 | (20.9) | 4,998,867 | (20.8) | 5,012,206 | (20.7) | |
4 | 4,641,638 | (19.6) | 4,688,953 | (19.5) | 4,702,796 | (19.4) | |
5 – least deprived | 4,296,857 | (18.2) | 4,326,425 | (18.0) | 4,336,616 | (17.9) | |
Missing | 411,451 | (1.7) | 518,182 | (2.2) | 629,089 | (2.6) | |
Influenza vaccine* | No | 17,664,340 | (74.7) | 17,582,584 | (73.2) | 15,677,039 | (64.8) |
Yes | 5,995,532 | (25.3) | 6,448,198 | (26.8) | 8,530,614 | (35.2) | |
Number of GP consultations†| Mean (SD) | 5.3 | (8.5) | 5.2 | (8.4) | 5.4 | (9.2) |
Number of antibiotics* | Mean (SD) | 0.5 | (1.7) | 0.5 | (1.7) | 0.4 | (1.7) |
Prevalent infection | No | 23,230,490 | (98.2) | 23,729,776 | (98.7) | 23,943,144 | (98.9) |
Yes | 429,382 | (1.8) | 301,006 | (1.3) | 264,509 | (1.1) | |
Prevalent antibiotic | No | 22,811,275 | (96.4) | 23,258,823 | (96.8) | 23,457,447 | (96.9) |
Yes | 848,597 | (3.6) | 771,959 | (3.2) | 750,206 | (3.1) | |
COVID-19 positive test (SGSS)^ | No | 23,659,872 | (100) | 21,635,599 | (96.9) | 19,736,175 | (86.2) |
Yes | 0 | (0.0) | 689,525 | (3.1) | 3,155,901 | (13.8) | |
Recorded death | No | 22,943,991 | (97.0) | 23,502,520 | (97.8) | 23,912,424 | (98.8) |
Yes | 715,881 | (3.0) | 528,262 | (2.2) | 295,229 | (1.2) | |