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Table 1 Main characteristics of studies included in the systematic review

From: Is there a sex-shift in prevalence of allergic rhinitis and comorbid asthma from childhood to adulthood? A meta-analysis

Study characteristics Number of studies
Total 10
Study period
 2000–2007 7
 2008–2014 3
Region
 Africa 1
 Asia 7
 South America 2
Sample size analysed
 < 1000 2
 1001–5000 1
 5001–10,000 3
 10,001–100,000 4
Age category (in years)
 0–10 6
 11–17 2
 18–79 2
Urbanicity
 Urban 7
 Rural/urban 1
 Unclear/not reported 2
Method for assessing prevalence
 ISAAC questionnaire 8
 ECHRS questionnaire 2
  1. ISAAC International Study of Asthma and Allergies in Childhood, ECRHS European Community Respiratory Health Survey