From:  Allergy in the Po Valley: evolution of sensitization profiles and phenology throughout 33 years and possible relationship with climate change
 

Synoptical exposition of the changes on phenological data of main allergenic plants and patients’ sensitization profile, averages of annual values: initial five years compared to the final five years

PollensSeason duration, days (P) Total count, grain/m3 (P)Sensitizations percentage (P)
Graminaceae110 vs 165 (P = 0.002)9,694 vs 10,513 (P = 0.178)67 vs 73 (P = 0.102)
Parietaria164 vs 187 (P = 0.007)6,418 vs 10,382 (P = 0.062)53 vs 18 (P = 0.001)
Betulaceae82 vs 86 (P = 0.394)1,381 vs 1,586 (P = 0.386)15 vs 28 (P < 0.001)
Olea29 vs 35 (P = 0.363)375 vs 279 (P = 0.352)2 vs 23 (P < 0.001)
Ambrosia18 vs 35 (P = 0.018)165 vs 720 (P = 0.032)2 vs 8 (P = 0.013)
Artemisia38 vs 18 (P = 0.014)459 vs 90 (P = 0.008)13 vs 21 (P = 0.437)