Figure 3
From: Ambient temperature and coronary heart disease mortality in Beijing, China: a time series study
The estimated hot effects associated with 99 th percentile temperature (30.5°C) relative to 90 th percentile of temperature (27.0°C) on group-specific CHD mortality over 15 days of lag, using time series and time-stratified case-crossover models with 5 degrees of freedom natural cubic spline for temperature and 4 degrees of freedom natural cubic spline for lag.