nter-correlations between explanatory variables, and pre-hospital delay.  ![](pntd.0000000.t000){#pntd-0000000-t000-0}                                                                                    0\.                                       0\.                                       0\.                                      0\.                                       0\.                                       0\.                                       0\.                                       0\.                                      0\.                                     00\.                                     00\.                                     00\.                   00\.                    00\.                    00\.   