Table 2.

Correlations between minimum mortality temperatures (MMT) and local sociodemographic characteristics.

Period	Population density	Unemployment rate	Proportion of secondary school graduates	Infant mortality rate
P1: 1968–1981	–0.01 (p = 0.89)	0.30 (p = 10–5)	0.13 (p = 0.06)	–0.01 (p = 0.89)
P2: 1982–1995	0.00 (p = 1)	0.30 (p = 10–5)	0.10 (p = 0.15)	0.11 (p = 0.11)
P3: 1996–2009	0.00 (p = 1)	0.26 (p = 10–4)	0.03 (p = 0.66)	0.12 (p = 0.08)
The correlations were computed between the estimated MMT and the sociodemographic characteristics of the 211 grid squares with > 7,500 deaths during each of the three study periods and a U/J-shaped curve for each period. Correlations were assessed with Pearson’s correlation coefficient. p-Value indicates the significance level of the test of independence.