Table 2.

Environmental data.

Item	Site 1	Site 2	p value
Working days (days)	42	43
WBGT (°C)
Maximum	30.9 (28.7–32.3)	32.6 (29.8–34.2)	0.004
Minimum	25.7 (23.0–27.5)	26.4 (25.1–28.7)	0.004
Average	28.4 (25.5–30.1)	30.2 (27.5–31.2)	0.014
Dry bulb temperature (°C)
Maximum	33.7 (31.2–35.2)	36.8 (32.5–39.4)	0.001
Minimum	27.7 (24.9–29.3)	27.9 (25.5–32.9)	0.042
Average	31.1 (28.0–32.7)	33.0 (29.5–36.1)	0.003
Relative humidity (%)
Maximum	72.0 (67.9–79.0)	80.1 (63.6–99.9)	0.271
Minimum	50.2 (46.1–53.8)	49.2 (39.7–56.9)	0.568
Average	59.5 (54.7–64.9)	58.8 (48.4–73.2)	0.709

Italic font describes significant difference (p < 0.05).

n or median (25–75 percentile).

P value was calculated by using the Wilcoxon rank sum test.