Partial correlations of putative factors affecting the onset of influenza autumn 2009 pandemic wave in 176 Eastern US locations.

Each of the five variables in the first row (geographic distance, network distance, school opening time, absolute humidity, humidity anomalies), residuals are computed from linear regression with the onset of influenza timings for locations in the East of the US. This table gives the correlation between these residuals and a second variable, listed in the first column.For the residuals from regression with geographic or network distance (first two columns), weak correlation is found with absolute humidity (p−4) and schools (p = 0.02). For the residuals from school openings and both humidity measures (last three columns), any of the other variables give a significant correlation (p = 0.02 for one combination and p−4 for the other 11).