Table 2. Clinical characteristics of the cases included for NPTs.

C	Age	Gender	PT pollen SPT	Pru p 9 SPT	Symptoms
1	40	F	100	100	Nasal obstruction, itching in the nose and eyes sometimes with wheezing from February to June with relapses in September-October.
2	45	F	100	200	Nasal obstruction with rhinorrhea from March to June often accompanied by wheezing.
3	15	F	400	100	Sneezing, rhinorrhea and nasal obstruction from February to June accompanied by itching in the eyes.
4	62	M	100	110	Nasal obstruction with itching and pruritus and rhinorrhea accompanied by pruritus and redness in the eyes through the year with more intensity from March to June.
5	27	M	100	100	Nasal obstruction with rhinorrhea and itching in nose and eyes when exposed to peach trees in flowering season.
6	22	M	200	-	Pruritus and erythema in the eyes with nasal pruritus and obstruction from February to early June.
7	15	F	120	-	Nasal obstruction with rhinorrhea and itching eyes accompanied by wheezing when visiting the farm in the spring. Control of bronchial symptoms with B2-agonist inhalers.
8	45	M	200	-	Itching and erythema in the eyes accompanied by nasal obstruction and sneezing during the whole year more intense from late June to late April.
9	58	F	100	-	Nasal symptoms in spring from March to June.
10	44	F	190	-	Nasal obstruction, rhinorrhea and sneezing accompanied by pruritus and eye redness in spring (May and June).

NPT: nasal provocation test. C: case number. M: male, F: female. PT pollen SPT: skin prick test to Peach tree pollen. Pru p 9 SPT: skin prick test to Pru p 9. Negative result is shown as (-).

Positive SPT is shown as the percentage of the wheal area of histamine given the histamine value of 100.