Bullous pemphigoid and pemphigus vulgaris  Design Retrospective
historical cohort study. Setting Computerised medical records
from the health improvement network, a large population based UK
general practice database. Participants Patients with pemphigus
vulgaris and bullous pemphigoid diagnostic codes and age, sex,
and practice matched controls. Main outcome measures Incidence
and mortality compared with the control population by calendar
period, age group, sex, geographical region, and degree of
social deprivation. Results 869 people with bullous pemphigoid
and 138 people with pemphigus vulgaris were identified. The
median age at presentation for bullous pemphigoid was 80 (range
23-102) years, and 534 (61%) patients were female. The median
age at presentation for pemphigus vulgaris was 71 (21-102)
years, and 91 (66%) patients were female. Incidences of
bullouspemphigoid and pemphigus vulgaris were 4.3 (95%
confidence interval 4.0 to 4.6) and 0.7 (0.6 to 0.8) per 100000
person years. The incidence of bullous