Table 1.

Effect of the birch pollen immunotherapy measured with nasal challenges.

	Nasal Challenge Score on the Highest Concentration BP Allergen (3000 BU/mL)
Months AIT	0	12	24
Patient	Score	Score	Score	Change
1	5	1	4	−1
2	8	5	2	−6
3	6	9	8	2
4	11	2	4	−7
5	6	2	0	−6
6	3	4	1	−2
7	11	6	1	−10
8	4	6	5	+1
Median
	6		3	−3 (p = 0.07)

This scoring system of the nasal challenge was graded in points, and the total score ranged from 0 to 11 points, where 0 stands for absence of symptoms and 11 for a maximum of symptoms. The various items scored were sneezing, rhinorrhoea, difficulty in breathing, pruritus of nose and conjunctivitis.