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Table 1 The representativeness of the clinically examined sample based on the questionnaire study data*

From: Sensitization to airborne allergens among adults and its impact on allergic symptoms: a population survey in northern Vietnam

Symptoms or conditions The entire cohort Invited to clinical examinations Participants in clinical examinations Participants in skin prick test Difference (p-value)**
n = 5,782 n = 1,500 n = 684 n = 533
Ever asthma 4.5 4.3 4.1 3.8 0.467
Physician diagnosed asthma 3.9 3.3 3.2 3.0 0.581
Asthma medicine 2.1 1.9 1.6 1.1 0.121
Allergic rhinitis 17.2 20.7 19.2 16.8 0.013
Recurrent wheeze 3.7 3.4 3.7 3.2 0.579
Wheezing without a cold 3.2 2.8 3.4 3.2 0.396
Attack of SOB 5.2 4.9 5.8 4.7 0.433
Dyspnea 3.5 3.6 3.9 4.0 0.458
  1. *Prevalence (%) of symptoms and conditions in the entire cohort, among those invited to the clinical examinations, and those who participated in the clinical examinations.
  2. **Difference between participants in skin prick testing and non-participants in ages ≤60 years old.