Environmental Temperature and Thermal Indices: What Is the Most Effective Predictor of Heat-Related Mortality in Different Geographical Contexts?

Table 3

Correlation analyses between daily average, minimum, and maximum UTCI versus direct thermal indices and air temperature indicators in urban and suburban areas of Florence and Livorno during the warmest period of the year (May–October) from 2006 to 2008.

Daily thermal indices and air temperature indicators	Inland plain city: Florence		Coastal plain city: Livorno		Mean values from all stations
	Urban; (missing data = 0%)	Suburban; (missing data = 0.4%)	Urban; (missing data = 0%)	Suburban; (missing data = 0%)	Slope; 𝑅^2 (%)
	Slope; 𝑅^2 (%)	Slope; 𝑅^2 (%)	Slope; 𝑅^2 (%)	Slope; 𝑅^2 (%)
Average
ATsun	1.193; 96.22	1.121; 96.85	1.284; 96.41	1.114; 96.51	1.178; 96.50
ATsha	1.029; 96.27	0.971; 96.76	1.073; 96.10	0.926; 96.71	1.000; 96.46
ATind	0.949; 95.00	0.891; 94.61	1.008; 94.80	0.821; 88.95	0.917; 93.34
𝑇air	0.865; 96.07	0.796; 94.82	0.827; 94.62	0.562; 87.24	0.763; 93.19
Minimum
ATsun	1.280; 97.32	1.160; 95.26	1.293; 97.43	0.992; 96.21	1.192; 96.56
ATsha	1.113; 97.41	1.014; 94.82	1.138; 97.99	0.848; 96.46	1.028; 96.67
ATind	1.038; 96.07	0.935; 90.50	1.070; 96.11	0.711; 83.53	0.939; 91.55
𝑇air	0.866; 93.50	0.764; 87.95	0.854; 92.60	0.502; 79.27	0.747; 88.33
Maximum
ATsun	1.110; 93.61	1.050; 94.03	1.263; 91.80	1.176; 89.51	1.150; 92.24
ATsha	0.951; 91.06	0.909; 92.49	0.960; 85.96	0.869; 83.11	0.922; 88.16
ATind	0.863; 89.77	0.830; 90.59	0.891; 84.15	0.792; 76.15	0.844; 85.17
𝑇air	0.881; 93.58	0.824; 93.59	0.801; 87.70	0.549; 76.63	0.764; 87.88

UTCI: Universal Thermal Climate Index; AT_sun: apparent temperature assessed outdoors also taking into consideration the solar radiation contribution; AT_sha: apparent temperature assessed outdoors in the shade; AT_ind: apparent temperature assessed in indoor conditions; 𝑇_air: environmental temperature.