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Table 2 Jugular venous pressure

From: Evaluation of clinical efficacy and safety of cervical trauma collars: differences in immobilization, effect on jugular venous pressure and patient comfort

    P-values of comparisons
Collar type Mean mmHg Range mmHg Without Stifneck Miami J Vista Philadelphia
Without 9.4 ± 1.4 6 – 13.5      
Stifneck 10.5 ± 2.1 5.5 - 14 0,146     
Miami J 11.7 ± 2.4 5 - 16 < 0.001 0.269    
Vista 13.5 ± 2.5 10 – 17.5 < 0.001 < 0.001 0.024   
Philadelphia 16.3 ± 3.3 7.5 - 20 < 0.001 < 0.001 < 0.001 < 0.001 -
  1. The mean, standard deviation and range of jugular venous pressure, at baseline (without a collar) and with the four different collars tested. Collars in order of increasing effect on jugular venous pressure. P-values of comparisons are shown in the right part of the table.