Table 5.

The predictors of farmers' productivity.

	Adjusted coefficients				Crude coefficients
	B	S.E	Beta		B	S.E	Beta
WBGT	−1.040	0.066	−0.600	<0.001	−1.058	0.069	−0.610	<0.001
BMI	−0.064	0.024	−0.119	0.008	−0.120	0.027	−0.222	<0.001
Age	0.023	0.011	0.089	0.033	0.000	0.013	0.001	0.983
Gender	0.873	0.169	0.208	<0.001	1.032	0.205	0.246	<0.001

^∗Significant at p=0.05 level. R² = 0.444: the four factor model (WBGT, gender, age, and BMI) explained 44.4% of the variance in productivity for multiple regression model.