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Table 1 Characteristics of the study subjects (N = 703)

From: Age of asthma onset and vulnerability to ambient air pollution: an observational population-based study of adults from Southern Taiwan

 

Asthma onset > 12 years, n (%)

 
 

No

Yes

P

(n = 253)

(n = 450)

Age, years

38.8 ± 5.1

38.3 ± 4.8

0.2

Sex

  

0.1

 Male

100 (39.5)

152 (33.8)

 

 Female

153 (60.5)

298 (66.2)

 

BMI

23.8 ± 3.8

23.8 ± 4.0

0.9

Education

   

 Middle school or less

62 (24.5)

117 (26.0)

0.3

 High school

119 (47.0)

228 (50.7)

 

 College or beyond

72 (28.5)

105 (23.3)

 

Family income

  

0.02

  < 13,300 USD

75 (29.6)

180 (40.0)

 

 13,300–33,000 USD

147 (58.1)

228 (50.7)

 

  > 33,000 USD

31 (12.3)

42 (9.3)

 

Current smoking

62 (25.6)

96 (21.9)

0.3

  1. BMI body mass index
  2. Regarding current smoking status, the total numbers for asthmatics with age at onset ≤ 12 years and > 12 years were 242 and 438, respectively, because of missing data