Fig. 3From: Comparisons between mild and severe cases of hand, foot and mouth disease in temporal trends: a comparative time series study from mainland ChinaCross correlations (with 95 % CI) of the short-term fluctuations from lags −7 to +7 days. a cross correlation coefficients, b partial cross correlation coefficients. The red dash line is the reference line of cross correlation coefficient equals to zero. A positive lag means the series of severe cases lag behind the series of mild cases, whereas a negative lag means the series of severe cases lead ahead the series of mild casesBack to article page