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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)