Summary of results. Collars in order of decreasing immobilization, increasing effect on jugular venous pressure and decreasing comfort. Tables 1, 2 and 3 show where there was a significant difference between the collars, compared to baseline and each other. However, in this figure a double-headed arrow is used to show where there was not a significant difference between entities. The Stifneck collar seems to suit well in emergency circumstances (greatest immobilization, least effect on jugular venous pressure, but third regarding comfort, so it should probably not be used for long-term treatment). The Miami J collar seems to be a good all-round collar for both emergency and long-term treatment (second in all parameters without differing significantly from those in the first place). The Vista collar seems more suited for long-term treatment (first place regarding comfort, third regarding effect on jugular venous pressure but forth concerning immobilization). The Philadelphia collar seems only suited for short-term treatment (highest effect on jugular venous pressures, third concerning immobilization and fourth place regarding comfort).