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Table 3 Comparison of the postural parameters (secondary outcome) before and after intervention

From: Immediate effects of a lumbar spine manipulation on pain sensitivity and postural control in individuals with nonspecific low back pain: a randomized controlled trial

Outcome Group Mean pre-
(standard deviation)
Mean post-
(standard deviation)
Post-Pre
(95% IC)
Area of the ellipse (cm2) Control 2.2 (± 1.6) 1.7 (± 1.3) −0.5
(−0.7; 1.7)
Intervention 1.1 (± 0.9) 1.1 (± 0.8) 0.0
(−0.7; 0.7)
COP displacement (cm) Control 44.3 (± 10.2) 42.5 (± 7.9) −1.8
(−9.5; 6.0)
Intervention 40.7 (± 7.9) 41.5 (± 8.0) 0.8
(−5.9; 7.6)
COP RMS Velocity (cm/s) Control 2.7 (± 0.3) 2.7 (± 0.4) 0.0
(−0.3; 0.3)
Intervention 2.5 (± 0.3) 2.5 (± 0.3) 0.0
(−0.2; 0.2)
Difference between COP and COPG in AP (cm) Control 1.0 (± 0.7) 1.2 (± 0.7) 0.2
(−0.3; 0.8)
Intervention 1.0 (± 0.6) 0.8 (± 0.4) −0.2
(− 0.7; 0.2)
Difference between COP and COPG in ML (cm) Control 0.6 (± 0.6) 0.8 (± 0.8) 0.2
(−0.5; 0.8)
Intervention 0.6 (± 0.4) 0.5 (± 0.3) −0.1
(− 0.4; 0.2)
  1. COP Center Of Pressure, RMS Root Mean Square, COPG Center Of Projected Gravity, AP Anterior-Posterior, ML Medium-Lateral