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. 2013 Oct;2(4):160–166. doi: 10.3978/j.issn.2224-4336.2013.10.05

Table 5. Age of the first asthma attack of children in three areas [n (%)].

Group n Below 4 4-7-year-old 7-14-year-old
Urban area 551 422 (76.6) 99 (18.0) 30 (5.5)
Suburban area 150 122 (81.3) 19 (12.7) 9 (6.0)
Rural area 142 110 (77.5) 21 (14.8) 11 (7.8)