Table 1

Validity Results

All Blocks

C2-3 Block

C5-6 Block

Kappa Values

K = 0.675

K = 0.756

K = 0.460

SE = 0.041

SE = 0.045

SE = 0.091

Z = 17.067

Z = 16.823

Z = 5.039

Specificity

98%

98%

91%

Sensitivity

74%

78%

55%

K = Kappa coefficient SE = Standard Error Z = Test Statistic Specificity is the ability to correctly identify non-fixed segments Sensitivity is the ability to detect a fixation if present

Humphreys et al. BMC Musculoskeletal Disorders 2004 5:19   doi:10.1186/1471-2474-5-19