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Table 8 Two-sided paired t-tests for mean difference between applicator-reported wind speed and AgWeathernet (AWN) wind speed (n=57)

From: Examining the role of wind in human illness due to pesticide drift in Washington state, 2000–2015

Speed comparison Mean of differences (mph) 95% CI p-value
Spray start time only
 AR-High a vs. AWN −1.00 (− 1.99, −0.01) 0.049
 AR-Avg b vs. AWN −1.96 (−2.84, − 1.09) <  0.001
 AR-Low c vs. AWN − 2.92 (− 3.77, − 2.07) <  0.001
Entire spray period
 AR-High a vs. AWN − 1.28 (− 2.16, − 0.40) 0.005
 AR-Avg b vs. AWN − 2.24 (− 3.01, − 1.47) <  0.001
 AR-Low c vs. AWN −3.20 (− 3.96, − 2.44) <  0.001
  1. a. AR-High: Highest applicator-reported wind speed. On average, AR-High speed was 1.00 mph lower than 15-min average AWN speed at the time of application start (95% CI: − 1.99, − 0.01; p = 0.049) and 1.28 lower throughout the entire spray period (95% CI: − 2.16, − 0.40; p = 0.005)
  2. b. AR-Avg: Average applicator-reported wind speed. On average, AR-Avg speed was 1.96 mph lower than 15-min average AWN speed at the time of application start (95% CI: − 2.84, − 1.09; p < 0.001) and 2.24 lower than AWN throughout the entire spray period (95% CI: − 3.01, − 1.47; p < 0.001)
  3. c. AR-Low: Lowest applicator-reported wind speed. On average, AR-Low speed was 2.92 mph lower than 15-min average AWN speed at the time of application start (95% CI: − 3.77, − 2.07; p < 0.001) and 3.20 lower than AWN throughout the entire spray period (95% CI: − 3.96, − 2.44; p < 0.001)