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Table 2 Relative risk (with 95% CI) of extreme cold and hot temperatures on respiratory outpatient visits at lag 0–7 days in Dongguan city, China

From: Morbidity burden of respiratory diseases attributable to ambient temperature: a case study in a subtropical city in China

Diseases Relative risk
Extreme cold Extreme heat
Total respiratory 1.02 (0.99, 1.05) 1.13 (1.01, 1.26)
COPD 1.12 (1.01, 1.24) 1.11 (0.91, 1.37)
Bronchiectasis 1.02 (0.95, 1.09) 1.24 (0.96, 1.60)
Asthma 1.04 (1.00, 1.08) 1.09 (0.92, 1.29)
  1. The extreme cold is the fifth percentile of temperature (12.6 °C), and the extreme heat is the 95th percentile of temperature (30.3 °C), compared with the optimal temperature at a lag of 0–7 days