Table 2. Overnight hospital admissions for respiratory infections and related conditions (principal diagnosis in the J00–99 range*) in Auckland District Health Board and Counties Manukau District Health Board during 2006–2010.

Conditions	IC10 codes	Average per year	Average per week (summer)	Average per week (winter)
Acute upper respiratory infections	J00–06	873	14	22
Influenza and pneumonia	J09–18	2790	38	84
Acute bronchitis	J20	91	1	3
Acute bronchiolitis	J21	1246	15	42
Unspecified acute lower respiratory tract infection	J22	906	13	26
Chronic bronchitis and emphysema	J40–43	155	2	4
Chronic obstructive pulmonary disease	J44	1560	25	39
Asthma	J45–46	1430	25	32
Bronchiectasis	J47	301	5	7
Respiratory failure	J96	79	2	2
Total		9431	140	261

* The following respiratory conditions (roughly 1352 cases per year) were excluded because most of them are not likely to be classed as acute respiratory infections: J30–39, J60–70, J80–84, J90–94, J95, J97–99.

Summer – December to March; Winter – June to September.