Table 1.
Demographics and Norovirus Detection in APPETITE Study Participants
| Gastroenteritis Case Patients, No. (%)a | |||
|---|---|---|---|
| Demographics and Norovirus Detection | ED (n = 2725) | Health Link (n = 1006) | Controls, No. (%)a (n = 2135) |
| Age group, mo | |||
| <12 | 817 (30) | 286 (28) | 825 (39) |
| 12–23 | 689 (25) | 359 (36) | 461 (22) |
| 24–35 | 341 (13) | 143 (14) | 216 (10) |
| 36–59 | 414 (15) | 118 (12) | 273 (13) |
| 60–215 | 463 (17) | 100 (10) | 360 (17) |
| Data missing | 1 (0) | 0 | 0 |
| Sex | |||
| Female | 1259 (46) | 456 (45) | 935 (44) |
| Male | 1466 (54) | 550 (55) | 1063 (50) |
| Data missing | 0 | 0 | 137 (6) |
| Zone | |||
| Calgary | 1609 (59) | 534 (53) | 1453 (68) |
| Edmonton | 814 (30) | 203 (20) | 500 (23) |
| North, Central, or South | 82 (3) | 202 (20) | 43 (2) |
| Data missing | 220 (8) | 67 (7) | 139 (7) |
| Period | |||
| December 2014 to June 2015 | 292 (11) | 166 (17) | 21 (1) |
| July 2015 to June 2016 | 817 (30) | 246 (24) | 419 (20) |
| July 2016 to June 2017 | 828 (30) | 267 (27) | 904 (42) |
| July 2017 to June 2018 | 721 (26) | 316 (31) | 748 (35) |
| July 2018 to August 2018 | 67 (2) | 11 (1) | 43 (2) |
| Season enrolled | |||
| January–March | 661 (24) | 295 (29) | 392 (18) |
| April–June | 862 (32) | 290 (29) | 516 (24) |
| July–September | 591 (22) | 150 (15) | 676 (32) |
| October–December | 611 (22) | 271 (27) | 551 (26) |
| Specimen testedb | 2684 (98) | 635 (63) | 1342 (63) |
| Norovirus detected | 669 (25) | 229 (36) | 49 (4) |
| Norovirus GI detected | 25 (0.9) | 6 (0.9) | 8 (0.6) |
| Ct, median (IQR) | 24.4 (17.6–31.4) | 19.8 (16.1– 21.2) | 29.6 (25.9–34.4) |
| Codetected pathogen | 10 (40) | 4 (67) | 0 |
| Norovirus GII detected | 646 (24) | 224 (35) | 41 (3) |
| Ct, median (IQR) | 18.8 (15.4–25.1) | 17.7 (16.1–20.0) | 26.3 (22.7–28.5) |
| Codetected pathogen | 257 (40) | 82 (37) | 14 (34) |
| Matched to a medically attended gastroenteritis episode | 2065 (76) | 199 (20) | NA |
Abbreviations: APPETITE, Alberta Provincial Pediatric EnTeric Infection TEam; Ct, cycle threshold; ED, emergency department; GI, genogroup I; GII, genogroup II; IQR, interquartile range; NA, not applicable.
aData represent no. (%) of case patients or controls unless otherwise specified.
bNot all enrolled participants provided a specimen. This is because some ED case patients and all Health Link case patients and control participants agreed to collect rectal swab and/or stool specimens at home, but not all participants returned their specimens. In addition, some specimens were inadequate for testing.