Table 3.

Classification of correct and incorrect predictions of the Alnus and Corylus pollen season start in Krakow in 1991–2010

Observed	Predicted—YES (season start)	Predicted—NO (no season start)	% of correct predictions	Predicted—YES (season start)	Predicted—NO (no season start)	% of correct predictions	Predicted—YES (season start)	Predicted—NO (no season start)	% of correct predictions
Taxon	Alnus			Corylus			Betula
Season start	6	8	42.86	7	7	50.00	51	2	96.23
No season start	3	50	94.34	4	52	92.86	5	15	75.00
Odds ratio: 12.50 %; correct: 83.58 %				Odds ratio: 13.00 %; correct: 84.29 %			Odds ratio: 76.50 %; correct: 90.41 %