Fig. 2
The annual temporal dynamics of pertussis at national level in Chile for the period 1932–2010. a The time series of incidence rate (cases/100000 hab.) for Chile (blue), the annual birth rates (normalized red line) and the annual vaccine coverage (green line); b The wavelet power spectrum of loge pertussis incidence (differenced; top panel), the increasing spectrum intensity is from violet to red color; the dotted black curves show the statistically significant area (threshold 5 % confidence interval) the stripped area delimits the cone of influence (region not influenced by edge effects)