Table 1.
Distribution of cases of severe acute respiratory syndrome coronavirus-2 in study cohort by detected variants for different characteristics and proportion hospitalized, Norway, 3 May–15 August 2021.
| Characteristics | Study cohort | Variant type (% by characteristic) |
Hospitalized cases (% of diagnosed cases) |
||||
|---|---|---|---|---|---|---|---|
| Alpha | Delta | Alpha | Delta | Total | |||
| Total | 20,055 (100%) | 12,078 (60%) | 7977 (40%) | 240 (2.0%) | 107 (1.3%) | 347 (1.7%) | |
| Sex | Female | 9433 (47%) | 5750 (48%) | 3683 (46%) | 104 (1.8%) | 53 (1.4%) | 157 (1.7%) |
| Male | 10,622 (53%) | 6328 (52%) | 4294 (54%) | 136 (2.2%) | 54 (1.3%) | 190 (1.8%) | |
| Age group (years) | 0–24 | 9986 (50%) | 6292 (52%) | 3964 (46%) | 11 (0.2%) | 13 (0.4%) | 24 (0.2%) |
| 25–44 | 6559 (33%) | 3523 (29%) | 3036 (38%) | 69 (2.0%) | 44 (1.5%) | 113 (1.7%) | |
| 45–64 | 3060 (15%) | 2003 (17%) | 1057 (13%) | 120 (6.0%) | 35 (3.3%) | 155 (5.1%) | |
| ≥65 | 450 (2.2%) | 260 (2.2%) | 190 (2.4%) | 40 (15%) | 15 (7.9%) | 55 (12%) | |
| Norwegian born | Yes | 14,106 (70%) | 8743 (72%) | 5363 (67%) | 131 (1.5%) | 49 (0.9%) | 180 (1.3%) |
| No | 5802 (29%) | 3241 (27%) | 2561 (32%) | 101 (3.1%) | 55 (2.2%) | 156 (2.7%) | |
| Unknown | 147 (0.7%) | 94 (0.8%) | 53 (0.7%) | 8 (8.5%) | 3 (5.7%) | 11 (7.5%) | |
| Risk for severe COVID-19a | No underlying comorbidities | 18,291 (91%) | 10,962 (91%) | 7329 (92%) | 173 (1.6%) | 86 (1.2%) | 259 (1.4) |
| Medium-risk comorbidity | 1637 (8.2%) | 1040 (8.6%) | 597 (7.5%) | 57 (5.5%) | 16 (2.7%) | 73 (4.5%) | |
| High-risk comorbidity | 127 (0.6%) | 76 (0.6%) | 51 (0.6%) | 10 (13%) | 5 (9.8%) | 15 (12%) | |
| Vaccination status at date of positive test | Not vaccinated | 15,140 (75%) | 10,713 (89%) | 4427 (56%) | 184 (1.7%) | 73 (1.6%) | 257 (1.7%) |
| Vaccinated with one dose <21 days before positive test | 1722 (8.5%) | 726 (6.0%) | 996 (12%) | 35 (4.8%) | 7 (0.7%) | 42 (2.4%) | |
| Partially vaccinated | 2386 (12%) | 461 (3.8%) | 1925 (24%) | 12 (2.6%) | 14 (0.7%) | 26 (1.1%) | |
| Fully vaccinated | 807 (4.0%) | 178 (1.5%) | 629 (7.9%) | 9 (5.1%) | 13 (2.1%) | 22 (2.7%) | |
COVID-19, coronavirus disease 2019.
a
Risk for severe disease based on underlying comorbidities that are associated with moderate or high risk of serious illness regardless of age. Details on the definitions of medium- and high-risk categories are provided in Section 1 of the online supplementary material.