Table 2 Hourly productivity loss (%)...

Table 2

Hourly productivity loss (%) calculated with the epidemiological function for workers exposed to the sun and working in shady areas in Florence (Italy) and Guangzhou (China) during the summers of 2017 and 2018

Working times	Productivity loss (%) for workers exposed to the sun [mean WBGT ± SD]		Productivity loss (%) for workers in shady areas [mean WBGT ± SD]
Working times	Florence	Guangzhou	Florence	Guangzhou
WT_8–17	2.4% (2.2–2.6) [24.2 °C ± 3.1]	17.4% (16.8–18.0) [29.5 °C ± 2.1]	0.4% (0.4–0.4) [21.8 °C ± 2.4]	6.8% (6.6–7.0) [27.5 °C ± 1.4]
WT_7–16	2.1% (1.9–2.3) [23.4 °C ± 3.6]	17.0% (16.4–17.7) [29.4 °C ±2.1]	0.3% (0.3–0.4) [21.3 °C ±2.7]	6.4% (6.2–6.6) [27.4 °C ± 1.4]
WT_6–15	1.9% (1.7–2.1) [22.4 °C ± 4.3]	15.8% (15.1–16.5) [29.0 °C ± 2.4]	0.3% (0.2–0.3) [20.6 °C ± 3]	5.9% (5.7–6.1) [27.2 °C ± 1.5]
p-value	<0.001	<0.001	<0.001	<0.001

Working times	Productivity loss (%) for workers exposed to the sun [mean WBGT ± SD]		Productivity loss (%) for workers in shady areas [mean WBGT ± SD]
Working times	Florence	Guangzhou	Florence	Guangzhou
WT_8–17	2.4% (2.2–2.6) [24.2 °C ± 3.1]	17.4% (16.8–18.0) [29.5 °C ± 2.1]	0.4% (0.4–0.4) [21.8 °C ± 2.4]	6.8% (6.6–7.0) [27.5 °C ± 1.4]
WT_7–16	2.1% (1.9–2.3) [23.4 °C ± 3.6]	17.0% (16.4–17.7) [29.4 °C ±2.1]	0.3% (0.3–0.4) [21.3 °C ±2.7]	6.4% (6.2–6.6) [27.4 °C ± 1.4]
WT_6–15	1.9% (1.7–2.1) [22.4 °C ± 4.3]	15.8% (15.1–16.5) [29.0 °C ± 2.4]	0.3% (0.2–0.3) [20.6 °C ± 3]	5.9% (5.7–6.1) [27.2 °C ± 1.5]
p-value	<0.001	<0.001	<0.001	<0.001

Note(s): Confidence intervals are indicated in round brackets. Hourly mean WBGT ± the standard deviation are indicated in square brackets

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