Table 5 Grades of the SPT results in case group.

From: A survey of allergic conjunctivitis in children in China

 

Grades

N

%

Dermatophagoides pteronyssinus

Grade 1

34

19.32%

Grade 2

38

21.59%

Grade 3

70

39.77%

Grade 4

34

19.32%

Dermatophagoides farinae

Grade 1

42

23.86%

Grade 2

24

13.64%

Grade 3

76

43.18%

Grade 4

34

19.32%

  1. Grade 1 is 25% of area of histamine-induced wheal, Grade 2 is 50% of this area, Grade 3 is 100% of this area, Grade 4 is 200% of it.