Table 1

Characteristics of diagnostic subgroups

Diagnostic subgroups
PNDS (n=9)GOR (n=8)CVA (n=10)Dual (n=8)Idiopathic (n=8)
Age (years) mean (range)46 (26–63)54.1 (34–77)47.2 (18–69)43 (18–63)47.4 (31–60)
Cough duration (months)
mean (range)100.6 (9–240)80 (8–240)80.7 (3–240)45.5 (2–144)19 (6–36)
  • PNDS = post-nasal drip syndrome; GOR = gastro-oesophageal reflux; CVA = cough variant asthma.

  • Atopic status based on history and total serum IgE (normal <120 kU/l) and specific serum IgE to four common inhaled allergens (house dust mite, mixed grasses, epithelia mix and cat/dog dander) (score <1 rated negative) measured by radioallergosorbent test (RAST).