Baseline characteristics of people who tested positive for SARS-CoV-2 by reverse transcription polymerase chain reaction (index participants) and household contacts
| Characteristic | Index participants, no. (%)* | Household contacts, no. (%)* | ||||
|---|---|---|---|---|---|---|
| Overall n = 180 | Children n = 74 | Adults n = 106 | Overall n = 515 | Children n = 266 | Adults n = 249 | |
| Age, median (IQR), yr | 33.9 (9.6–41.5) | 8.2 (5.4–12.5) | 40.5 (36.3–45.3) | 17.1 (8.7–41.4) | 8.9 (5.2–12.9) | 41.9 (36.6–47.0) |
| Age group, yr | ||||||
| ≤ 3 | 11 (6.1) | 11 (14.9) | – | 47 (9.1) | 47 (17.7) | – |
| 4–11 | 43 (23.9) | 43 (58.1) | – | 142 (27.6) | 142 (53.4) | – |
| 12–17 | 20 (11.1) | 20 (27.0) | – | 77 (15.0) | 77 (28.9) | – |
| 18–29 | 9 (5.0) | – | 9 (8.5) | 17 (3.3) | – | 17 (6.8) |
| 30–39 | 42 (23.3) | – | 42 (39.6) | 80 (15.5) | – | 80 (32.1) |
| 40–49 | 44 (24.4) | – | 44 (41.5) | 108 (21.0) | – | 108 (43.4) |
| ≥ 50 | 11 (6.1) | – | 11 (10.4) | 44 (8.5) | – | 44 (17.7) |
| Sex | ||||||
| Female | 81 (45.0) | 24 (32.4) | 57 (53.8) | 275 (53.4) | 139 (52.3) | 136 (54.6) |
| Male | 98 (54.4) | 50 (67.6) | 48 (45.3) | 238 (46.2) | 126 (47.4) | 112 (45.0) |
| Missing | 1 (0.6) | 0 (0.0) | 1 (0.9) | 2 (0.4) | 1 (0.4) | 1 (0.4) |
| Indigenous | ||||||
| Yes | 1 (0.6) | 0 (0.0) | 1 (0.9) | 17 (3.3) | 9 (3.4) | 8 (3.2) |
| No | 179 (99.4) | 74 (100.0) | 105 (99.0) | 494 (95.9) | 255 (95.9) | 239 (96.0) |
| Missing | 0 (0.0) | 0 (0.0) | 0 (0.0) | 4 (0.8) | 2 (0.8) | 2 (0.8) |
| Race or ethnicity† | ||||||
| Black | 15 (8.3) | 7 (9.5) | 8 (7.5) | 44 (8.6) | 27 (10.2) | 17 (6.9) |
| Asian | 3 (1.7) | 2 (2.7) | 1 (0.9) | 18 (3.5) | 10 (3.8) | 8 (3.2) |
| South Asian | 0 (0.0) | 0 (0.0) | 0 (0.0) | 4 (0.8) | 3 (1.1) | 1 (0.4) |
| West Asian/Arab | 15 (8.3) | 7 (9.5) | 8 (7.5) | 44 (8.6) | 25 (9.5) | 19 (7.7) |
| Latin American | 5 (2.8) | 5 (6.8) | 0 (0.0) | 8 (1.6) | 4 (1.5) | 4 (1.6) |
| White | 149 (82.8) | 62 (83.8) | 87 (82.1) | 415 (81.1) | 216 (81.8) | 199 (80.2) |
| Other‡ | 2 (1.1) | 1 (1.4) | 1 (0.9) | 3 (0.6) | 2 (0.8) | 1 (0.4) |
| Missing | 0 (0.0) | 0 (0.0) | 0 (0.0) | 3 (0.6) | 2 (0.8) | 1 (0.4) |
| Underlying comorbidity | ||||||
| Yes | 46 (25.6) | 7 (9.5) | 39 (36.8) | 93 (18.0) | 42 (15.8) | 51 (20.5) |
| No | 134 (74.4) | 67 (90.5) | 67 (63.2) | 419 (81.4) | 222 (83.4) | 197 (79.1) |
| Missing | 0 (0.0) | 0 (0.0) | 0 (0.0) | 3 (0.6) | 2 (0.8) | 1 (0.4) |
| Smoking or vaping | 46 (25.6) | 5 (6.8) | 41 (38.7) | 142 (27.6) | 14 (5.3) | 128 (51.4) |
| Daily/frequently | 6 (13.0) | 1 (20.0) | 5 (12.2) | 20 (14.1) | 0 (0.0) | 20 (15.6) |
| Sometimes/rarely | 12 (26.1) | 2 (40.0) | 10 (24.4) | 25 (17.6) | 6 (42.8) | 19 (14.8) |
| Past smoker/vaper | 28 (60.9) | 2 (40.0) | 26 (63.4) | 94 (66.2) | 6 (42.8) | 88 (68.8) |
| Missing | 0 (0.0) | 0 (0.0) | 0 (0.0) | 3 (2.1) | 2 (14.3) | 1 (0.8) |
| Working outside home§ | ||||||
| Yes | 52 (28.9) | 3 (4.1) | 49 (46.2) | 88 (17.1) | 4 (1.5) | 84 (33.7) |
| No | 128 (71.1) | 71 (95.9) | 57 (53.8) | 424 (82.3) | 260 (97.7) | 164 (65.9) |
| Missing | 0 (0.0) | 0 (0.0) | 0 (0.0) | 3 (0.6) | 2 (0.8) | 1 (0.4) |
| Student‡ | ||||||
| Yes | 76 (42.2) | 69 (93.2) | 7 (6.6) | 261 (50.7) | 245 (92.1) | 16 (6.4) |
| No | 104 (57.8) | 5 (6.8) | 99 (93.4) | 251 (48.7) | 19 (7.1) | 232 (93.2) |
| Missing | 0 (0.0) | 0 (0.0) | 0 (0.0) | 3 (0.6) | 2 (0.8) | 1 (0.4) |
| Symptom burden¶ | ||||||
| Asymptomatic | 19 (10.6) | 13 (17.6) | 6 (5.7) | 260 (50.5) | 140 (52.6) | 120 (48.2) |
| Mild | 154 (85.6) | 60 (81.1) | 94 (88.7) | 248 (48.2) | 124 (46.6) | 124 (49.8) |
| Moderate | 5 (2.8) | 1 (1.4) | 4 (3.8) | 3 (0.6) | 0 (0.0) | 3 (1.2) |
| Severe | 2 (1.1) | 0 (0.0) | 2 (1.9) | 1 (0.2) | 0 (0.0) | 1 (0.4) |
| Missing | 0 (0.0) | 0 (0.0) | 0 (0.0) | 3 (0.6) | 2 (0.8) | 1 (0.4) |
Note: IQR = interquartile range.
↵* Except where noted otherwise.
↵† Self-reported. Participants could choose more than 1 category.
↵‡ Unspecified selection of more than 1 category.
↵§ At the time the participant or a household member tested positive.
↵¶ Mild = no hospital admission, moderate = hospital admission but not intensive care unit admission, severe = intensive care unit admission.