Table 3 Incidence of asthma attacks and clinical symptoms

 Total peak flow days

2242 (100)

2023 (100)

1731 (100)

4286 (100)

4649 (100)

4678 (100)

 Mild (person day) (%)

428 (19.1)

358 (17.7)

554 (32.0)

1080 (25.2)

1011 (21.8)

729 (15.6)

 Moderate (person day) (%)

115 (5.1)

158 (7.8)

232 (13.4)

289 (6.7)

309 (6.7)

216 (4.6)

 Severe (person day) (%)

44 (1.9)

73 (3.6)

58 (3.4)

59 (1.4)

68 (1.5)

62 (1.3)

  0: None

2183 (87.9)

1802 (81.6)

2015 (91.3)

4156 (88.6)

4800 (91.5)

4910 (92.0)

  1: Attack without dyspnea

221 (8.9)

339 (15.4)

92 (4.2)

457 (9.7)

379 (7.2)

329 (6.2)

  2: Attack with little dyspnea

68 (2.7)

60 (2.7)

99 (4.5)

75 (1.6)

59 (1.1)

82 (1.5)

  3: Attack with much dyspnea

12 (0.5)

7 (0.3)

2 (0.1)

3 (0.1)

6 (0.1)

15 (0.3)

 Attack in exercise (person day) (%)

33 (1.3)

69 (3.1)

9 (0.4)

47 (1.0)

165 (3.2)

82 (1.5)

 Sleep disturbance (person day) (%)

22 (0.9)

19 (0.9)

21 (1.0)

24 (0.5)

24 (0.5)

37 (0.7)

 The usage of the inhalants (person day) (%)

110 (4.4)

159 (7.2)

79 (3.6)

276 (5.9)

152 (2.9)

231 (4.3)

 The usage of the oral medicine (person day) (%)

69 (2.8)

200 (9.1)

29 (1.3)

178 (3.8)

141 (2.7)

155 (2.9)

 Emergency visits (person day) (%)

14 (0.6)

23 (1.0)

11 (0.5)

11 (0.2)

17 (0.3)

20 (0.4)

 Either symptoms (person day) (%)**

401 (16.1)

604 (27.4)

263 (11.9)

730 (15.6)

571 (10.9)

637 (11.9)

 Skin (person day) (%)

93 (3.7)

375 (17.0)

146 (6.6)

573 (12.2)

742 (14.2)

442 (8.3)

 Eye (person day) (%)

371 (14.9)

283 (12.8)

188 (8.5)

493 (10.5)

463 (8.8)

444 (8.3)

 Nose (person day) (%)

562 (22.6)

863 (39.1)

699 (31.7)

1020 (21.7)

1310 (24.9)

1002 (18.8)

 Either symptoms (person day) (%)***

797 (32.1)

1044 (47.3)

793 (35.9)

1390 (29.6)

1875 (35.8)

1460 (27.3)