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Table 1 Number of participants with available data

From: Change in the prevalence asthma, rhinitis and respiratory symptom over a 20 year period: associations to year of birth, life style and sleep related symptoms

 

Respiratory symptoms

Smoking

BMI

Sleep related

1990–1994

21,595

14,780

6604

1867

1999–2001

16,049

15,930

15,930

15,762

2010–2012

13,093

12,738

12,930

12,811

≥ 2 surveys

17,711

13,117

12,504

11,338

All three surveys

11,269

10,858

3669

1143