Summary of time-series regression model for influenza parameter estimates that reflect the effects of influenza on asthma hospitalisations by age and borough, New York, January 2002 to December 2012
| Variable | Influenza estimate | SE | P values |
| Age (years) | |||
| 0–4 | −0.034 | 0.02 | 0.06 |
| 5–17 | −0.038 | 0.02 | 0.11 |
| 18–44 | 0.053 | 0.01 | <0.01 |
| 45–64 | 0.068 | 0.01 | <0.01 |
| 65+ | 0.061 | 0.01 | <0.01 |
| Borough | |||
| Bronx | 0.020 | 0.012 | 0.10 |
| Brooklyn | 0.023 | 0.011 | 0.03 |
| Manhattan | 0.043 | 0.013 | <0.01 |
| Queens | 0.001 | 0.011 | 0.93 |
| Staten Island | 0.022 | 0.021 | 0.20 |
The time-series model (seasonal ARIMA (1,1,0)x(0,1,1)12 model) was applied to stratified age groups and boroughs to determine correlation between influenza and asthma by each stratum.