TABLE 1—
Average Monthly Percentage of Reported ILI in the Month Preceding Interview, Health Care Seeking, Influenza Diagnosis, and Antiviral Treatment Among Adults, by Selected Demographics: BRFSS, United States, September 1, 2009–March 31, 2010
| Reported ILI |
Sought Health Care for ILI |
Clinical Diagnosis of Influenza Among Those Who Sought Health Care for ILI |
Antiviral Treatment Among Those Clinically Diagnosed With Influenza |
|||||
| Demographics | Sample Size, No. | % (95% CI) | Sample Size, No. | % (95% CI) | Sample Size, No. | % (95% CI) | Sample Size, No. | % (95% CI) |
| Total | 216 431 | 8.1 (7.8, 8.4) | 14 601 | 40 (38, 42) | 6148 | 26 (23, 29) | 1258 | 36 (31, 41) |
| Sex | ||||||||
| Male | 81 931 | 7.1 (6.7, 7.6) | 4609 | 33 (30, 36) | 1567 | 27 (22, 32) | 360 | 34 (26, 44) |
| Female | 134 500 | 9.0* (8.6, 9.4) | 9992 | 45* (43, 47) | 4581 | 26 (23, 28) | 898 | 37 (31, 43) |
| Race/ethnicity | ||||||||
| White, non-Hispanic | 169 376 | 8.4 (8.1, 8.7) | 11 126 | 42 (40, 44) | 4600 | 21 (19, 24) | 862 | 36 (31, 42) |
| Black, non-Hispanic | 17 129 | 7.2** (6.3, 8.2) | 1061 | 45 (38, 51) | 504 | 30 (20, 41) | 93 | 31a (19, 45) |
| Hispanic | 14 508 | 7.5 (6.7, 8.4) | 1128 | 43 (37, 48) | 472 | 39** (30, 47) | 160 | 33a (22, 46) |
| American Indian/Alaska Native | 2916 | 16** (12, 22) | 370 | 39 (29, 51) | 172 | 25 (14, 40) | 44 | 29a (12, 54) |
| Other race, Non-Hispanic | 8618 | 9.1 (7.8, 11) | 708 | 40 (34, 47) | 306 | 38** (28, 49) | 81 | 37a (23, 55) |
| Age group, y | ||||||||
| 18–49 | 71 684 | 10*** (10, 11) | 7051 | 37*** (35, 40) | 2708 | 29*** (26, 33) | 667 | 39*** (33, 46) |
| 50–64 | 72 167 | 6.8*** (6.4 ,7.2) | 5053 | 43*** (40, 46) | 2178 | 20 (17, 23) | 403 | 27 (21, 35) |
| ≥ 65 | 70 880 | 3.2 (3.0, 3.5) | 2418 | 56 (53, 60) | 1224 | 17 (14, 22) | 179 | 22 (14, 34) |
| Census Region | ||||||||
| Northeast | 33 440 | 7.7 (7.0, 8.4) | 1983 | 44† (40, 49) | 809 | 28† (22, 34) | 194 | 37a (26, 50) |
| Midwest | 51 872 | 7.8 (7.3, 8.3) | 3279 | 39† (36, 43) | 1307 | 22† (18, 27) | 268 | 30 (21, 40) |
| South | 74 424 | 8.4 (8.0, 8.9) | 5369 | 42† (39, 45) | 2564 | 23† (19, 28) | 428 | 45 (36, 54) |
| West | 54 423 | 8.2 (7.5, 8.8) | 3847 | 33† (30, 37) | 1384 | 34† (28, 41) | 347 | 29 (20, 40) |
Note. BRFSS = Behavioral Risk Factor Surveillance System; CI = confidence interval; ILI = influenza-like illness.
a
Estimate might be unreliable because the unweighted sample size is > 50 or the CI half width is > 10. Caution should be used when interpreting this estimate.
*P < .05, with men as reference group.
**P < .05, with non-Hispanic White as reference group.
***P < .05, with respondents aged ≥ 65 years as reference group.
†P < .05, χ2 test among census region.