TABLE. Estimated numbers of influenza-associated illnesses, medically attended illnesses, and hospitalizations — Utah, 2016–17 and 2017–18 influenza seasons.
| Age group (yrs) | Population* | No. of influenza-associated hospitalizations | Unadjusted hospitalization rate† | % Tested | Average % sensitivity | Underdetection multiplier | Adjusted hospitalization rate† | Estimated burden
no. (95% CI)§ |
||
|---|---|---|---|---|---|---|---|---|---|---|
| Illnesses | Medically attended illnesses | Hospitalizations | ||||||||
|
2016–17 influenza season
| ||||||||||
| 0–4 |
253,338 |
96 |
38 |
42 |
92 |
2.56 |
97 |
35,300 (25,600–45,000) |
23,700 (17,200–30,100) |
250 (180–310) |
| 5–17 |
666,090 |
59 |
9 |
31 |
92 |
3.48 |
31 |
74,900 (47,400–102,000) |
39,000 (24,700–53,300) |
210 (130–280) |
| 18–49 |
1,362,564 |
233 |
17 |
43 |
94 |
2.47 |
42 |
103,000 (86,900–118,000) |
38,000 (32,200–43,800) |
580 (490–660) |
| 50–64 |
441,528 |
247 |
56 |
65 |
94 |
1.62 |
91 |
37,800 (32,400–43,200) |
16,200 (13,900–18,600) |
400 (340–460) |
| ≥65 |
320,801 |
784 |
244 |
76 |
80 |
1.63 |
399 |
14,100 (12,900–15,300) |
7,880 (7,220–8,540) |
1,300 (1,200–1,400) |
|
Total
|
3,044,321
|
1,419
|
47
|
58
|
—
|
—
|
89
|
265,000 (205,000–324,000)
|
125,000 (95,100–154,000)
|
2,700 (2,300–3,100)
|
|
2017–18 influenza season
| ||||||||||
| 0–4 |
255,200 |
168 |
66 |
55 |
93 |
1.95 |
128 |
46,900 (38,100–55,800) |
31,500 (25,500–37,400) |
330 (270–390) |
| 5–17 |
671,499 |
129 |
19 |
57 |
93 |
1.89 |
36 |
89,100 (70,000–108,000) |
46,300 (36,400–56,300) |
240 (190–300) |
| 18–49 |
1,393,111 |
292 |
21 |
47 |
93 |
2.30 |
48 |
120,000 (104,000–136,000) |
44,300 (38,300–50,300) |
670 (580–760) |
| 50–64 |
446,451 |
388 |
87 |
66 |
92 |
1.64 |
142 |
60,000 (52,800–67,100) |
25,800 (22,700–28,900) |
640 (560–710) |
| ≥65 |
335,572 |
1,214 |
362 |
78 |
78 |
1.65 |
598 |
22,100 (20,500–23,600) |
12,400 (11,500–13,200) |
2,000 (1,900–2,100) |
| Total | 3,101,833 | 2,191 | 71 | 63 | — | — | 125 | 338,000 (285,000–391,000) | 160,000 (134,000–186,000) | 3,900 (3,500–4,300) |
Abbreviation: CI = confidence interval.
* Population estimates from Utah's Public Health Indicator Based Information System are vintage 2017 U.S. Census Bureau July 1 estimates based on the 2010 census counts (http://ibis.health.utah.gov/query/result/pop/PopMain/Count.htm). The estimates were produced by the U.S. Census Bureau’s Population Estimates Program in collaboration with the National Center for Health Statistics and released in June 2018.
† Hospitalizations per 100,000 population.
§ CIs were calculated from the combined standard error of the hospitalization rate, percentage tested, and pooled test sensitivity, assuming independence. If these parameters are not independent, the assumption will result in an underestimation of the variability and tighter CIs.