Table 1.
Characteristics of A/H1N1 influenza hospitalizations and deaths by pandemic wave, Maricopa County, April 1, 2009 to March 31, 2010.
| Variable | Total | Pandemic wave | P valuea (degrees of freedom) | |
|---|---|---|---|---|
| Spring | Fall | |||
| Age (years) | ||||
| <18 | 246/546 (45.1) | 62/144 (43.1) | 184/402 (45.8) | 0.045 (2) |
| 18–49 | 183/546 (33.5) | 41/144 (26.9) | 142/402 (35.3) | |
| ≥50 | 117/546 (21.4) | 41/144 (28.4) | 76/402 (18.9) | |
| Race/ethnicity | ||||
| Hispanics | 206/546 (37.7) | 60/144 (41.7) | 146/402 (36.3) | 0.54 (5) |
| Whites, non-Hispanic | 207/546 (37.9) | 52/144 (36.1) | 155/402 (38.6) | |
| Black, non-Hispanic | 62/546 (11.4) | 13/144 (9.0) | 49/402 (12.2) | |
| Native American | 34/546 (6.2) | 9/144 (6.2) | 25402 (6.2) | |
| Asian | 5/546 (0.9) | 0/144 (0.0) | 5/402 (1.2) | |
| Other/unknown | 32/546 (5.9) | 10/144 (6.9) | 22/402 (5.5) | |
| Gender | ||||
| Female | 303/546 (55.5) | 80/144 (55.6) | 223/402 (55.5) | 0.99 (1) |
| Male | 243/546 (44.5) | 64/144 (44.4) | 179/402 (44.5) | |
| Patients according to severity | ||||
| ICU | 153/519 (29.5) | 41/140 (29.3) | 112/379 (29.6) | 0.95 (1) |
| Mechanical ventilation | 106/522 (20.3) | 28/144 (19.4) | 78/378 (20.6) | 0.76 (1) |
| Deaths | 77/546 (14.1) | 11/144 (7.6) | 66/402 (16.4) | 0.009 (1) |
Wave 1 (spring) refers to April 1 through August 15, 2009; fall wave refers to August 16, 2009 through March 31, 2010. Data are percentages of cases unless otherwise specified.
aDetermined by the Chi-square test statistic. P values for age and race/ethnicity obtained from group wise comparisons, while P values for gender and severity comparisons correspond to each category.