Table 1 Effect of treatment on productivity, core body temperature, hyperthermia, breaks, and physical activity. Below each coefficient, we report 95% confidence intervals in parenthesis and two-tailed p values, respectively. We denote conventional statistical significance as ***p < 0.01, **p < 0.05, *p < 0.1 for two-sided t tests. The dependent variable in Column (1) is the log of total output. In Columns (3), (4), and (5), the dependent variable is the inverse hyperbolic sine of, number of minutes with moderate hyperthermia (with moderate hyperthermia (core body temperature exceeding 38.5 ^∘C), total breaks, and number of minutes spent in moderate-to-vigorous physical activity, respectively. The coefficients can be interpreted as semi-elasticities following appropriate econometric transformations⁸⁰. Core body temperatures are estimated from oral temperatures and heart rate data using a validated algorithm⁷³.

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