Univariate Analysis of Characteristics Associated With Mortality From Norovirus Outbreaks Reported to the National Outbreak Reporting System and CaliciNet, 2009–2016
| . | Mortality Rate . | Models of Mortality Rate . | ||||
|---|---|---|---|---|---|---|
| Characteristic . | Total No. of Cases . | No. of Deaths . | Rate per 10000 Cases . | Rate Ratio . | (95% CI) . | P Value . |
| Outbreak characteristics | ||||||
| Non-GII.4 | 39401 | 47 | 11.9 | 1.00 | … | … |
| GII.4 | 68971 | 177 | 25.7 | 2.36 | (1.58–3.56) | <.0001 |
| Nonhealthcare settings | 34179 | 7 | 2.0 | 1.00 | … | … |
| Healthcare settings | 73534 | 217 | 29.5 | 14.50 | (7.00–35.32) | <.0001 |
| Nonfoodborne | 94549 | 220 | 23.3 | 1.00 | … | … |
| Foodborne | 13823 | 4 | 2.9 | 0.11 | (.03–.28) | <.0001 |
| Case demographics | ||||||
| <50% female | 13884 | 13 | 9.4 | 1.00 | … | … |
| ≥50% female | 60596 | 106 | 17.5 | 1.59 | (.81–3.32) | .17 |
| <50% aged ≥75 y | 39964 | 47 | 11.8 | 1.00 | … | … |
| ≥ 50% aged ≥75 y | 36447 | 111 | 30.5 | 2.59 | (1.73–3.93) | <.0001 |
| Reported symptoms | ||||||
| <75% reported vomiting | 70020 | 170 | 24.3 | 1.00 | … | … |
| ≥75% reported vomiting | 30430 | 42 | 13.8 | 0.54 | (.35–.83) | .005 |
| <25% reported fever | 69576 | 160 | 23.0 | 1.00 | … | … |
| ≥25% reported fever | 30833 | 52 | 16.9 | 0.77 | (.51–1.16) | .21 |
| Seasonality | ||||||
| May–October | 17823 | 20 | 11.2 | 1.00 | … | … |
| November–April | 90549 | 204 | 22.5 | 2.11 | (1.24–3.74) | .007 |
| . | Mortality Rate . | Models of Mortality Rate . | ||||
|---|---|---|---|---|---|---|
| Characteristic . | Total No. of Cases . | No. of Deaths . | Rate per 10000 Cases . | Rate Ratio . | (95% CI) . | P Value . |
| Outbreak characteristics | ||||||
| Non-GII.4 | 39401 | 47 | 11.9 | 1.00 | … | … |
| GII.4 | 68971 | 177 | 25.7 | 2.36 | (1.58–3.56) | <.0001 |
| Nonhealthcare settings | 34179 | 7 | 2.0 | 1.00 | … | … |
| Healthcare settings | 73534 | 217 | 29.5 | 14.50 | (7.00–35.32) | <.0001 |
| Nonfoodborne | 94549 | 220 | 23.3 | 1.00 | … | … |
| Foodborne | 13823 | 4 | 2.9 | 0.11 | (.03–.28) | <.0001 |
| Case demographics | ||||||
| <50% female | 13884 | 13 | 9.4 | 1.00 | … | … |
| ≥50% female | 60596 | 106 | 17.5 | 1.59 | (.81–3.32) | .17 |
| <50% aged ≥75 y | 39964 | 47 | 11.8 | 1.00 | … | … |
| ≥ 50% aged ≥75 y | 36447 | 111 | 30.5 | 2.59 | (1.73–3.93) | <.0001 |
| Reported symptoms | ||||||
| <75% reported vomiting | 70020 | 170 | 24.3 | 1.00 | … | … |
| ≥75% reported vomiting | 30430 | 42 | 13.8 | 0.54 | (.35–.83) | .005 |
| <25% reported fever | 69576 | 160 | 23.0 | 1.00 | … | … |
| ≥25% reported fever | 30833 | 52 | 16.9 | 0.77 | (.51–1.16) | .21 |
| Seasonality | ||||||
| May–October | 17823 | 20 | 11.2 | 1.00 | … | … |
| November–April | 90549 | 204 | 22.5 | 2.11 | (1.24–3.74) | .007 |
Abbreviation: CI, confidence interval; GII.4, genogroup II type 4.
Univariate Analysis of Characteristics Associated With Mortality From Norovirus Outbreaks Reported to the National Outbreak Reporting System and CaliciNet, 2009–2016
| . | Mortality Rate . | Models of Mortality Rate . | ||||
|---|---|---|---|---|---|---|
| Characteristic . | Total No. of Cases . | No. of Deaths . | Rate per 10000 Cases . | Rate Ratio . | (95% CI) . | P Value . |
| Outbreak characteristics | ||||||
| Non-GII.4 | 39401 | 47 | 11.9 | 1.00 | … | … |
| GII.4 | 68971 | 177 | 25.7 | 2.36 | (1.58–3.56) | <.0001 |
| Nonhealthcare settings | 34179 | 7 | 2.0 | 1.00 | … | … |
| Healthcare settings | 73534 | 217 | 29.5 | 14.50 | (7.00–35.32) | <.0001 |
| Nonfoodborne | 94549 | 220 | 23.3 | 1.00 | … | … |
| Foodborne | 13823 | 4 | 2.9 | 0.11 | (.03–.28) | <.0001 |
| Case demographics | ||||||
| <50% female | 13884 | 13 | 9.4 | 1.00 | … | … |
| ≥50% female | 60596 | 106 | 17.5 | 1.59 | (.81–3.32) | .17 |
| <50% aged ≥75 y | 39964 | 47 | 11.8 | 1.00 | … | … |
| ≥ 50% aged ≥75 y | 36447 | 111 | 30.5 | 2.59 | (1.73–3.93) | <.0001 |
| Reported symptoms | ||||||
| <75% reported vomiting | 70020 | 170 | 24.3 | 1.00 | … | … |
| ≥75% reported vomiting | 30430 | 42 | 13.8 | 0.54 | (.35–.83) | .005 |
| <25% reported fever | 69576 | 160 | 23.0 | 1.00 | … | … |
| ≥25% reported fever | 30833 | 52 | 16.9 | 0.77 | (.51–1.16) | .21 |
| Seasonality | ||||||
| May–October | 17823 | 20 | 11.2 | 1.00 | … | … |
| November–April | 90549 | 204 | 22.5 | 2.11 | (1.24–3.74) | .007 |
| . | Mortality Rate . | Models of Mortality Rate . | ||||
|---|---|---|---|---|---|---|
| Characteristic . | Total No. of Cases . | No. of Deaths . | Rate per 10000 Cases . | Rate Ratio . | (95% CI) . | P Value . |
| Outbreak characteristics | ||||||
| Non-GII.4 | 39401 | 47 | 11.9 | 1.00 | … | … |
| GII.4 | 68971 | 177 | 25.7 | 2.36 | (1.58–3.56) | <.0001 |
| Nonhealthcare settings | 34179 | 7 | 2.0 | 1.00 | … | … |
| Healthcare settings | 73534 | 217 | 29.5 | 14.50 | (7.00–35.32) | <.0001 |
| Nonfoodborne | 94549 | 220 | 23.3 | 1.00 | … | … |
| Foodborne | 13823 | 4 | 2.9 | 0.11 | (.03–.28) | <.0001 |
| Case demographics | ||||||
| <50% female | 13884 | 13 | 9.4 | 1.00 | … | … |
| ≥50% female | 60596 | 106 | 17.5 | 1.59 | (.81–3.32) | .17 |
| <50% aged ≥75 y | 39964 | 47 | 11.8 | 1.00 | … | … |
| ≥ 50% aged ≥75 y | 36447 | 111 | 30.5 | 2.59 | (1.73–3.93) | <.0001 |
| Reported symptoms | ||||||
| <75% reported vomiting | 70020 | 170 | 24.3 | 1.00 | … | … |
| ≥75% reported vomiting | 30430 | 42 | 13.8 | 0.54 | (.35–.83) | .005 |
| <25% reported fever | 69576 | 160 | 23.0 | 1.00 | … | … |
| ≥25% reported fever | 30833 | 52 | 16.9 | 0.77 | (.51–1.16) | .21 |
| Seasonality | ||||||
| May–October | 17823 | 20 | 11.2 | 1.00 | … | … |
| November–April | 90549 | 204 | 22.5 | 2.11 | (1.24–3.74) | .007 |
Abbreviation: CI, confidence interval; GII.4, genogroup II type 4.
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