Figure 4
From: Ambient temperature and coronary heart disease mortality in Beijing, China: a time series study
The estimated cold effects associated with 1 st percentile of temperature (−7.6°C) relative to 10 th percentile of temperature (−2.2°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.