Table 1. Overall and survey-specific ILI prevalence estimates by sex, age-group and borough, New York City, May 1–June 19, 2009.
| Survey 1* | Survey 2* | Combined Estimate May 1–June 19 | |||||||
| Number with ILI** | Percent with ILI | 95% CI | Number with ILI** | Percent with ILI | 95% CI | Number with ILI** | Percent with ILI | 95% CI | |
| Total | 576,000 | 6.9 | 6.0–7.9 | 1,007,000 | 12.0 | 10.0–14.6 | 1,318,000 | 15.8 | 13.2–19.0 |
| Sex | |||||||||
| Male | 266,00 | 6.7 | 5.3–8.5 | 402,000 | 10.1 | 7.5–13.3 | 540,000 | 13.5 | 10.2–18.0 |
| Female | 314,00 | 7.2 | 6.0–8.7 | 608,000 | 13.9 | 10.7–17.6 | 764,000 | 17.5 | 13.6–22.1 |
| Age Group | |||||||||
| 0–17 | 224,000 | 11.7 | 9.2–14.7 | 405,000 | 21.1 | 15.9–26.7 | 510,000 | 26.6 | 20.1–34.0 |
| 18–64 | 306,000 | 5.7 | 4.6–6.8 | 544,000 | 10.1 | 7.6–13.3 | 717,000 | 13.2 | 10.2–17.2 |
| 65+ | 45,000 | 4.3 | 3.0–6.3 | 59,000 | 5.7 | 4.1–7.1 | 91,000 | 8.8 | 6.2–12.6 |
| Borough | |||||||||
| Bronx | 50,000 | 3.6 | 2.2–5.7 | 127,000 | 9.1 | 5.8–13.4 | 155,000 | 11.1 | 7.0–16.6 |
| Brooklyn | 230,000 | 9.0 | 7.2–11.4 | 335,000 | 13.1 | 10.1–17.1 | 452,000 | 17.7 | 13.7–23.4 |
| Manhattan | 61,000 | 3.7 | 2.3–5.8 | 184,000 | 11.3 | 7.8–15.5 | 217,000 | 13.3 | 9.1–18.6 |
| Queens | 217,000 | 9.4 | 7.0–12.7 | 280,000 | 12.2 | 8.2–18.6 | 383,000 | 16.7 | 11.6–25.4 |
| Staten Island | 20,000 | 4.2 | 2.3–7.4 | 87,000 | 17.9 | 7.3–34.8 | 98,000 | 20.1 | 8.6–38.9 |
*Survey 1 conducted May 21–27, covering time period May 1–27. Survey 2 conducted June 15–19, covering time period May 15–June 19.
**Number with influenza-like illness (ILI) calculated by multiplying the group-specific 2007 population estimates by the percent with ILI and rounding to the nearest 1000.