Table 3.
Effect estimates (95% confidence intervals) from linear mixed effects models of post-shift mean reaction time (milliseconds), N = 44.
| Mean reaction time | Model 1a | Model 2b | Model 3c | Model 4d |
|---|---|---|---|---|
| Intercept | 2.75 (1.40, 4.09) | 2.89 (1.44, 4.35) | 2.74 (1.32, 4.16) | 2.82 (1.07, 4.58) |
| WBGTmax | −0.03 (−0.05, 0.01) | −0.03 (−0.06, 0.01) | −0.04 (−0.07, 0.00) | −0.03 (−0.07, 0.01) |
| Pre-shift mean reaction time (ms) | 0.65 (0.47, 0.82) | 0.63 (0.44, 0.82) | 0.61 (0.45, 0.79) | 0.62 (0.41, 0.82) |
| Sleep quality (ref: fairly bad) | ||||
| Fairly good | – | 0.10 (−0.18, 0.39) | 0.13 (−0.15, 0.40) | 0.13 (−0.17, 0.42) |
| Very good | – | 0.07 (−0.19, 0.33) | 0.07 (−0.18, 0.32) | 0.10 (−0.17, 0.36) |
| Shift duration (hrs) | – | – | 0.06 (−0.01, 0.12) | 0.06 (−0.02, 0.15) |
| Age | – | – | – | 0.00 (−0.01,0.01) |
| Gender (ref: male) | ||||
| Female | – | – | – | 0.12 (−0.19, 0.42) |
| Body mass index (kg/m2) | – | – | – | −0.01 (−0.03, 0.02) |
a
Adjusted for pre-shift reaction time.
b
Adjusted for pre-shift reaction time and sleep quality.
c
Adjusted for pre-shift reaction time, sleep quality, and shift duration.
d
Adjusted for pre-shift reaction time, sleep quality, shift duration, age, gender, and body mass index.