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Table 1 Characteristics of the study population of 4530 students at 22 schools in greater Wuhan, China

From: Respiratory symptoms in relation to residential coal burning and environmental tobacco smoke among early adolescents in Wuhan, China: a cross-sectional study

Characteristic %
Subjects  
Age (mean, SD) in years 13.6, 0.7
Gender  
Male
Female
52.5
47.5
Respiratory symptoms  
Wheezing with colds 19.4
Wheezing without colds 7.1
Bringing up phlegm with colds 16.7
Bringing up phlegm without colds 5.7
Coughing with colds 24.7
Coughing without colds 4.5
Exposures  
Smokers in child's household  
No smokers
1 smoker
2+ smokers
Father smokes
Mother smokes
Personal smoking by students
26.8
62.3
10.9
69.1
3.6
0.6
Exposure to coal burning  
No coal use
Coal used only for heating
Coal used only for cooking
Coal used for cooking and heating
54.2
8.8
25.9
11.1