Table 1

Clinical history of asthma and symptoms at index admission. Number of notes in which the variable was recorded (n) and % of these where the variable was present (all associations shown if p<0.20)

  • 1-1 Adjusted for age and sex.

  • 1-2 Adjusted for cardiovascular medication, systolic blood pressure and age and sex.

  • 1-3 Per additional day.

  • 1-4 Per 50 l/min increase in peak flow.

  • 5Pco2 >6.1 compared withPco2 ⩽6.1 and blood gases not done.

  • 1-6 British National Formulary Chapter 2.0 drugs.

  • 1-7 Compound inhaler which contains fenoterol 90 μg, ipratropium bromide 36 μg/metered inhalation.