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Table 1 Baseline characteristics of participants of biomechanical experiment and clinical study

From: Lumbar mechanical traction: a biomechanical assessment of change at the lumbar spine

  aDevices N bGender
Male: Female
bAge
(Mean)
Age
(SD)
Towing mode traction for 10 min
Biomechanical ST-2 L/2CL 14 9:5 35.1 11.1 A1, B
  10 4:6 47.7 9.7 A, B
OL-6500/6000 7 1:6 44.3 11.5 A, B
  7 3:4 40.7 10.4 A, A2
net 38 17:21 41.1 11.7  
Clinical A → B 49 27:22 42.2 12.6 A, B
B → A 46 19:27 41.5 13.6 A, B
  1. aMINATO Medical Science, ST-2 L/2CL and OG Wellness Technologies, OL-6500/6000
  2. Towing A = Vibration amplitude load was 30% of the preload. It’s repeated for traction 30 s and suspension 5 s
  3. Towing A1 = Vibration function at the frequency of 0.1 Hz was added onto the preload. Vibration amplitude load was 30% of the preload. It’s repeated for traction 60 s and suspension 10 s
  4. Towing A2 = Vibration amplitude load was 20% of the preload. It’s repeated for traction 30 s and suspension 5 s
  5. Towing B = Traction 30 s and suspension 5 s
  6. bAccording to t-test for equality of means between A → B and B → A, age is not significant with mean difference 0.768 (95% Confidence Interval of the Difference: − 4.555 to 6.091), p = 0.775
  7. Also, in Chi-Square, there was no significant difference of the male: female ratio between A → B and B → A, p = 0.179