Table 1.
Underlying conditions in patients with influenza A (2009/10 and 2010/11) and influenza B (2010/11)
| Underlying condition | Influenza A 2009/10 | Influenza A 2010/11 | Influenza B 2010/11 | Comparison seasons† P value | Comparison influenza types‡ P value | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| n | N* | % | n | N * | % | n | N* | % | |||
| None | 11 | 52 | 21 | 14 | 80 | 18 | 10 | 35 | 29 | 0·60 | 0·18 |
| Chronic renal failure | 3 | 49 | 6 | 4 | 80 | 5 | 0 | 35 | 0 | 0·79 | 0·18 |
| Cancer | 9 | 48 | 19 | 16 | 80 | 20 | 8 | 35 | 23 | 0·87 | 0·72 |
| Immunocompromised condition | 9 | 47 | 19 | 6 | 80 | 8 | 1 | 35 | 3 | 0·05 | 0·34 |
| Neurological disease | 9 | 47 | 19 | 0 | 80 | 0 | 1 | 35 | 3 | <0·001 | 0·13 |
| Diabetes | 10 | 52 | 19 | 7 | 80 | 9 | 5 | 35 | 14 | 0·08 | 0·38 |
| Chronic pulmonary disease | 11 | 49 | 22 | 14 | 80 | 18 | 7 | 35 | 20 | 0·49 | 0·75 |
| Obesity | 10 | 41 | 24 | 7 | 80 | 9 | 1 | 35 | 3 | 0·02 | 0·25 |
| Cardiovascular disease | 12 | 49 | 25 | 8 | 80 | 10 | 4 | 35 | 11 | 0·03 | 0·82 |
| Other underlying conditions | 14 | 47 | 30 | 19 | 80 | 24 | 3 | 35 | 8 | 0·46 | 0·06 |
| Pregnancy | 1 | 22 | 5 | 0 | 47 | 0 | 1 | 20 | 5 | 0·14 | 0·12 |
| Post-partum <42 days | 1 | 22 | 5 | 0 | 47 | 0 | 0 | 20 | 0 | 0·14 | NA |
*
Denominator showing those patients for which information on underlying illness was available.
†
z test comparing influenza A patients from seasons 2009/10 and 2010/11.
‡
z test comparing influenza A and B patients from the 2010/11 season.