The other meta-predictors—location-specific average and range of summer temperature—are borderline significant and explain a limited part of the residual heterogeneity.
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The sentences
(2009) provided evidence of a decrease in heat-related mortality rates, with a decreasing trend estimated to be between 0 and –2.6 deaths per standardized million in each decade between 1975 and 2004; Barnett (2007) estimated a decrease from 4.7% in 1987 to –0.4% in 2000 in the risk for cardiovascular mortality associated with a 10°F increase in summer temperature; Guo et al.