Table 4.
Correlation results between pollen indicators and meteorological variables (temperature and precipitation). Number of analyses and percent of analyses that reported a significant correlation between the pollen indicator and meteorological variable are shown. Correlation results with less than five studies for comparison are grayed out to indicate the low number of analyses and limitations to the results
| ConcentrationTemperature Correlation - Percent (n) | Precipitation Correlation - Percent (n) | |||||||
|---|---|---|---|---|---|---|---|---|
|
|
|
|||||||
| Positive | Negative | No Correlation | Total (n) | Positive | Negative | No Correlation | Total (n) | |
|
| ||||||||
| Main Pollen Season Start Date | ||||||||
| Trees | 12.2%(10) | 73.2%(60) | 14.6%(12) | 82 | 41.2%(7) | 11.8%(2) | 47.1%(8) | 17 |
| Weeds | 13.3%(2) | 53.3%(8) | 33.3%(5) | 15 | 33.3%(1) | 0.0%(0) | 66.7%(2) | 3 |
| Grasses | 4.2%(1) | 37.5%(9) | 58.3%(14) | 24 | 5.3%(1) | 15.8%(3) | 78.9%(15) | 19 |
| Total | 10.7%(13) | 63.9%(78) | 25.4%(31) | 122 | 23.1%(9) | 12.8%(5) | 64.1%(25) | 39 |
| Main Pollen Season Peak Date | ||||||||
| Trees | 4.3%(1) | 52.2%(12) | 43.5%(10) | 23 | 16.7%(1) | 33.3%(2) | 50.0%(3) | 6 |
| Weeds | 0.0%(0) | 18.2%(2) | 81.8%(9) | 11 | 0.0%(0) | 0.0%(0) | 100.0%(2) | 2 |
| Grasses | 0.0%(0) | 38.1%(8) | 61.9%(13) | 21 | 5.3%(1) | 0.0%(0) | 94.7%(18) | 19 |
| Total | 1.8%(1) | 40.0%(22) | 58.2%(32) | 55 | 7.4%(2) | 7.4%(2) | 85.2%(23) | 27 |
| Main Pollen Season End Date | ||||||||
| Trees | 5.6%(1) | 50.0%(9) | 44.4%(8) | 18 | 25.0%(1) | 0.0%(0) | 75.0%(3) | 4 |
| Weeds | 27.3%(3) | 0.0%(0) | 72.7%(8) | 1 | 50.0%(1) | 0.0%(0) | 50.0%(1) | 2 |
| Grasses | 40.0%(2) | 20.0%(1) | 40.0%(2) | 5 | 0.0%(0) | 0.0%(0) | 100.0%(2) | 2 |
| Total | 17.6%(6) | 29.4%(10) | 52.9%(18) | 34 | 25.0%(2) | 0.0%(0) | 75.0%(6) | 8 |
| Main Pollen Season Length | ||||||||
| Trees | 38.9%(14) | 22.2%(8) | 38.9%(14) | 36 | 10.0%(1) | 0.0%(0) | 90.0%(9) | 10 |
| Weeds | 50.0%(7) | 7.1%(1) | 42.9%(6) | 14 | 0.0%(0) | 50.0%(1) | 50.0%(1) | 2 |
| Grasses | 7.4%(2) | 14.8%(4) | 77.8%(21) | 27 | 20.8%(5) | 0.0%(0) | 79.2%(19) | 24 |
| Total | 30.8%(24) | 16.7%(13) | 52.6%(41) | 78 | 16.7%(6) | 2.8%(1) | 80.6%(29) | 36 |
| Annual Pollen Integral (API) | ||||||||
| Trees | 44.8%(61) | 19.3%(28) | 35.9%(52) | 141 | 17.7%(11) | 21.0%(13) | 61.3%(38) | 62 |
| Weeds | 38.6%(17) | 20.5%(9) | 40.9%(18) | 3 | 18.2%(4) | 13.6%(3) | 68.2%(15) | 22 |
| Grasses | 20.0%(7) | 17.1%(6) | 62.9%(22) | 35 | 48.3%(14) | 17.2%(5) | 34.5%(10) | 29 |
| Total | 40.3%(87) | 19.0%(43) | 40.7%(92) | 222 | 26.3%(30) | 18.4%(21) | 55.3%(63) | 114 |
| Average Daily Pollen Concentration | ||||||||
| Trees | 63.8%(30) | 25.5%(12) | 10.6%(5) | 47 | 2.5%(1) | 67.5%(27) | 30.0%(12) | 40 |
| Weeds | 82.6%(19) | 17.4%(4) | 0.0%(0) | 23 | 13.6%(3) | 59.1%(13) | 27.3%(6) | 22 |
| Grasses | 50.0%(4) | 37.5%(3) | 12.5%(1) | 8 | 22.2%(2) | 66.7%(6) | 11.1%(1) | 9 |
| Total | 67.7%(65) | 22.9%(22) | 9.4%(9) | 96 | 12.4%(11) | 59.6%(53) | 28.1%(25) | 89 |
| Peak Pollen Concentration | ||||||||
| Trees | 35.3%(6) | 29.4%(5) | 35.3%(6) | 17 | 66.7%(4) | 16.7%(1) | 16.7%(1) | 6 |
| Weeds | 27.3%(3) | 9.1%(1) | 63.6%(7) | 11 | 50.0%(1) | 0.0%(0) | 50.0%(1) | 2 |
| Grasses | 5.3%(1) | 10.5%(2) | 84.2%(16) | 19 | 70.6%(12) | 0.0%(0) | 29.4%(5) | 17 |
| Total | 21.3%(10) | 17.0%(8) | 61.7%(29) | 47 | 68.0%(17) | 4.0%(1) | 28.0%(7) | 25 |