Table 1 Correlation coefficients (Rs) between the frequency of alopecia areata (AA) flares and meteorological variables per month in Philadelphia, Pennsylvania, for children with AA, for children with comorbid AA and atopic conditions, and for children with AA without atopic conditions.
From: Influence of climate factors on pediatric alopecia areata flares in Philadelphia, Pennsylvania
All AA | AA with atopy | AA with no atopy | ||||
|---|---|---|---|---|---|---|
R | P value | R | P value | R | P value | |
Air pressure (mb) | 0.80 | 0.002 | 0.79 | 0.002 | 0.59 | 0.04 |
Number of rainy days | − 0.70 | 0.01 | − 0.63 | 0.03 | − 0.63 | 0.02 |
UV index: current month | − 0.66 | 0.02 | − 0.81 | 0.001 | − 0.38 | 0.23 |
Precipitation (mm) | − 0.66 | 0.02 | − 0.75 | 0.005 | − 0.43 | 0.17 |
Number of sunny days | 0.62 | 0.03 | 0.55 | 0.06 | 0.58 | 0.05 |
Temperature (celsius) | − 0.54 | 0.07 | − 0.75 | 0.005 | − 0.27 | 0.40 |
Wind speed (km/h) | 0.45 | 0.14 | 0.64 | 0.02 | 0.16 | 0.62 |
UV index: prior month | − 0.33 | 0.30 | − 0.61 | 0.03 | − 0.053 | 0.87 |
Wind gust (km/h) | 0.28 | 0.38 | 0.55 | 0.07 | < 0.01 | > 0.99 |
Hours of sunlight | − 0.28 | 0.38 | − 0.55 | 0.07 | < 0.01 | > 0.99 |
Cloudiness (%) | 0.20 | 0.53 | 0.45 | 0.15 | 0.07 | 0.83 |
Humidity (%) | − 0.18 | 0.59 | 0.03 | 0.93 | − 0.30 | 0.35 |
