Table 1

Comparisons of age and sex-specific rates (expressed as numbers of patients per 10 000 patient years at risk) from the GPRD and MSGP4 for asthma; hayfever or allergic rhinitis; COPD excluding asthma; acute bronchitis or bronchiolitis and “chest infection”; and pneumonia. All GPRD rates are a weighted average of 1991 and 1992 figures except hayfever which relates to 1992 only

  • 1-150 Small numbers (<30 patients) within age/sex category.