Table 2 Prevalence (%) of current respiratory symptoms by various subgroups (N = 33,632)

Total

13.5 (4,552)

6.8 (2,298)

Age

   6–7 year olds

13.7 (2,736)

8.4 (1,687)

   13–14 year olds

13.3 (1,816)

4.5 (611)

Gender

   male

14.6 (2,531)

7.4 (1,275)

   female

12.4 (2,012)

6.3 (1,019)

Parental asthma or allergies

   yes

17.6 (2,376)

8.9 (1,202)

   no

10.8 (2,176)

5.4 (1,096)

Urbanization level

   <10,000 inhabitants

11.2 (623)

5.3 (295)

   10–100,000 inhabitants

13.2 (1,246)

5.6 (534)

   100–500,000 inhabitants

14.8 (973)

7.1 (468)

   >500,000 inhabitants

14.2 (1,710)

8.3 (1,001)

Exposure to passive smoke

   yes

14.8 (2,509)

7.4 (1,254)

   no

12.2 (2,019)

6.2 (1,030)

Presence of mould/dampness

   yes

17.4 (631)

8.7 (314)

   no

12.9 (3,598)

6.5 (1,807)

   missing

14.8 (323)

8.1 (177)

Parental education

   primary school

15.1 (207)

7.8 (107)

   secondary school

14.2 (1,420)

7.4 (734)

   high school

13.3 (2,031)

6.5 (990)

   university

12.7 (853)

6.6 (443)

Floor level of apartment

   Ground

13.5 (1,273)

6.2 (585)

   1^st–2^nd floor

13.9 (1,962)

6.6 (933)

   3^rd floor or more

12.9 (1,231)

7.7 (738)

Change of residence

   Yes

12.6 (2,182)

6.3 (1,099)

   No

14.5 (2,174)

7.4 (1,109)