Table 1.

Initial programme theories of how UGS influence heat-related mortality in elderly persons

Reduction of exposure

IPT 1: By reducing outdoor temperature UGS reduce heat related mortality for elderly

IPT 2: By reducing indoor temperature UGS reduce heat related mortality for elderly

IPT 3: By providing a cool place UGS reduce heat related mortality for elderly

Reduction of vulnerability

IPT 4: By reducing co-morbidity UGS reduce heat-related mortality in elderly

Increase in heat-responsiveness

IPT 5: By increasing social interaction, participation, and cohesion UGS increase the heat responsiveness of elderly