Table 1

Demographic characteristics of the study population and COVID-19 episodes across three pandemic waves

Variable categoriesTotal study populationPts with ≥1 testPts. with ≥1 episodeCOVID-19 episodes
Wave 1*Wave 2*Wave 3*
Total863 974 (100%)184 953 (21.4%)16 025 (1.9%)2430 (0.3%)4324 (0.5%)9434 (1.1%)
Age group
 <25200 441 (23.2%)30 220 (16.3%)2632 (16.4%)81 (3.0%)385 (8.9%)2172 (23.0%)
 25–44220 996 (25.6%)41 959 (22.7%)3888 (24.3%)537 (22.1%)940 (21.7%)2464 (26.1%)
 45–64237 115 (27.4%)52 017 (28.1%)4337 (27.1%)850 (35%)1222 (28.3%)2313 (24.5%)
 65–74101 797 (11.8%)23 783 (12.9%)1417 (8.8%)229 (9.4%)427 (9.9%)773 (8.2%)
 75+103 625 (12.0%)36 974 (20.0%)3751 (23.4%)733 (30.2%)1350 (31.2%)1712 (18.2%)
Sex
 Male426 794 (49.4%)75 605 (40.9%)6533 (40.8%)897 (36.9%)1549 (35.8%)4135 (43.8%)
 Female437 180 (50.6%)109 348 (59.1%)9492 (59.2%)1533 (63.1%)2775 (64.2%)5299 (56.2%)
Any high-risk comorbidity
 No630 838 (73.0%)113 573 (61.4%)9975 (62.2%)1454 (59.8%)2401 (55.5%)6221 (65.9%)
 Yes233 136 (27.0%)71 381 (38.6%)6050 (37.8%)976 (40.2%)1923 (44.5%)3213 (34.1%)
Hospital admission ±28 days
 NoN/AN/A12 842 (80.1%)1770 (72.8%)3141 (72.6%)8088 (85.7%)
 YesN/AN/A3183 (19.9%)660 (27.2%)1183 (27.4%)1346 (14.3%)
Health board of residence
 A404 094 (46.8%)67 887 (36.7%)6882 (42.9%)779 (32.1%)1667 (38.6%)4473 (47.4%)
 B459 880 (53.2%)117 066 (63.3%)9143 (57.1%)1651 (67.9%)2657 (61.4%)4961 (52.6%)
Scottish Index of Multiple Deprivation quintile
 1 (most deprived)135 851 (15.7%)30 411 (16.4%)3194 (19.9%)426 (17.5%)888 (20.5%)1922 (20.4%)
 2145 538 (16.8%)31 357 (17.0%)2839 (17.7%)374 (15.4%)878 (20.3%)1604 (17.0%)
 3153 304 (17.7%)32 195 (17.4%)2808 (17.5%)447 (18.4%)746 (17.3%)1650 (17.5%)
 4203 258 (23.5%)46 426 (25.1%)3556 (22.2%)649 (26.7%)934 (21.6%)2007 (21.3%)
 5 (least deprived)152 013 (17.6%)29 995 (16.2%)2312 (14.4%)317 (13.0%)599 (13.9%)1417 (15.0%)
 Missing data74 010 (8.6%)14 569 (7.8%)1316 (8.2%)217 (8.9%)279 (6.5%)834 (8.8%)
  • *Individuals may appear in multiple waves and may have multiple episodes in a single wave if they occur >90 days apart.