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Table 2 Characteristics of tree pollen peaks and their correlation with the outcomes

From: The associations between daily spring pollen counts, over-the-counter allergy medication sales, and asthma syndrome emergency department visits in New York City, 2002-2012

Tree Pollen Type/outcome Average peak calendar datesa, b (S.D.) Average 10th-to-90th % Durationb, c days (S.D.) Rank Correlationd of Peak dates Rank Correlationd of Duration
OTC Allergy Med. Asthma syndrome ED visits OTC Allergy Med. Asthma syndrome ED visits
Elm 31-Mar (10.6) 15.0 (10.1) 0.55 0.50 -0.37 -0.38
Poplar 14-Apr (9.9) 17.0 (6.9) 0.35 0.60 -0.15 -0.20
Maple 18-Apr (13.5) 25.1 (10.2) 0.62 0.37 -0.28 -0.29
Birch 27-Apr (5.7) 17.1 (9.6) 0.67 0.40 0.76 0.88
Beech 30-Apr (5.7) 18.9 (6.1) 0.80 0.74 0.73 0.84
Ash 28-Apr (7.3) 12.6 (4.0) 0.90 0.49 0.19 0.33
Sycamore/London planetree 28-Apr (8.8) 12.5 (4.1) 0.91 0.51 0.32 0.49
Oak 4-May (9.3) 12.5 (5.5) 0.92 0.66 0.86 0.85
Hickory 27-May (6.7) 17.8 (5.7) 0.09 0.05 0.49 0.42
OTC Med Sales 2-May (7.9) 44.7 (2.2) NA 0.47 NA 0.89
Asthma Syndrome ED visits 11-May (9.9) 46.5 (1.4) 0.47 NA 0.89 NA
  1. Note: aFor each spring, the average peak date is defined as the average calendar date of the five highest pollen concentrations; bFor the outcomes, this computation was done for on and after April 15th; cFor each spring, the 10th-to-90th percentile duration is the period between the dates with the 10th and 90th cumulative sum percentile of concentrations; dSpearman’s rank correlation between the average peak date or duration of tree pollen vs. that of the outcome across years. The bold-faced correlations are significant at alpha = 0.05 level