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Table 2 Within-session and between-session reliability of stiffness measurements for lumbar tests

From: Reliability of a new loaded rolling wheel system for measuring spinal stiffness in asymptomatic participants

  Minimum Load Max Tolerable Load
  Mean (SD) of stiffness values (N/mm) ICC3, 1 (95%CI)/Single measures ICC3, 3 (95%CI)/Average measures Mean (SD) of stiffness values (N/mm) ICC3, 1 (95%CI)/Single measures ICC3, 3 (95%CI)/Average measures
Within- session Reliability (session 1/ N = 17) L5 2.6 (1.3) 0.99 (0.97_ 0.99) 1.00 (0.99_ 1.00) 9.0 (3.4) 0.99 (0.97_ 0.99) 1.00 (0.99_ 1.00)
L4 2.0 (1.5) 0.99 (0.97_ 1.00) 1.00 (0.99_ 1.00) 6.1 (3.0) 1.00 (0.99_ 1.00) 1.00 (0.99_ 1.00)
L3 2.0 (1.9) 0.92 (0.82_0.97) 0.97 (0.93_ 0.99) 6.2 (5.0) 0.95 (0.89_ 0.98) 0.98 (0.96_ 0.99)
L2 2.2 (1.7) 1.00 (0.99_ 1.00) 1.00 (0.99_ 1.00) 6.1 (4.4) 1.00 (0.99_ 1.00) 1.00 (0.99_ 1.00)
L1 2.7 (2.3) 0.98 (0.95_ 0.99) 0.99 (0.98_ 1.00) 7.4 (4.3) 0.99 (0.98_ 1.00) 1.00 (0.99_ 1.00)
Within- session Reliability (session 2/ N = 15) L5 2.3 (0.8) 0.99 (0.97_ 0.99) 1.00 (0.99_ 1.00) 8.1 (2.3) 0.98 (0.96_ 0.99) 1.00 (0.99_ 1.00)
L4 1.6 (0.6) 0.99 (0.98_ 1.00) 1.00 (0.99_ 1.00) 5.2 (1.6) 0.99 (0.98_ 1.00) 1.00 (0.99_ 1.00)
L3 1.6 (0.6) 0.99 (0.98_ 1.00) 1.00 (0.99_ 1.00) 5.0 (1.6) 0.99 (0.98_ 1.00) 1.00 (0.99_ 1.00)
L2 2.4 (2.0) 0.96 (0.90_ 0.98) 0.99 (0.96_ 0.99) 5.9 (3.0) 0.99 (0.98_ 1.00) 1.00 (0.99_ 1.00)
L1 3.0 (2.4) 0.96 (0.90_ 0.99) 0.99 (0.96_ 1.00) 7.1 (3.4) 0.98 (0.94_ 0.99) 0.99 (0.98_ 1.00)
  ICC3, 1 using the first trial ICC3, 1 using the mean of the 3 trials   ICC3, 1 using the first trial ICC3, 1 using the mean of the 3 trials
Between- session Reliability (N = 15) L5 2.2 (0.7) 0.81 (0.54_ 0.93) 0.75 (0.41_ 0.91) 8.1 (2.3) 0.85 (0.60_ 0.95) 0.82 (0.55_ 0.94)
L4 1.5 (0.5) 0.85 (0.63_ 0.95) 0.84 (0.60_ 0.94) 5.2 (1.6) 0.87 (0.66_ 0.96) 0.93 (0.80_ 0.98)
L3 1.5 (0.6) 0.88 (0.67–0.96) 0.86 (0.65_ 0.95) 5.0 (1.8) 0.86 (0.62_ 0.95) 0.88 (0.67_ 0.96)
L2 2.3 (1.9) 0.94 (0.82_ 0.98) 0.96 (0.86_ 0.99) 5.5 (2.6) 0.83 (0.57_ 0.94) 0.86 (0.63_ 0.95)
L1 2.8(2.6) 0.88 (0.68_ 0.96) 0.75 (0.38_ 0.92) 6.9 (3.5) 0.92 (0.75_ 0.97) 0.89 (0.70_ 0.96)
  1. Abbreviations: SD standard deviation, CI confidence interval, ICC intraclass correlation coefficient