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Table 1 Comparison of the mean and significance of the differences in pressure pain threshold pre-and post-intervention in the trigger point group (n = 30) versus the control group (n = 11) versus all subjects (n = 41).

From: The immediate effect of multiple mechanical impulses on electromyography and pressure pain threshold of lumbar latent trigger points: an experimental study

  Trigger point Control All subjects
  n = 30 n = 11 n = 41
Mean Pre (95 % CI) in kg/cm2 3.55 (3.20–3.90) 5.91 (5.18–6.64) 4.18 (3.73–4.64)
Mean Post (95 % CI) in kg/cm2 4.00 (3.56–4.44) 6.73 (5.77–7.68) 4.73 (4.18–5.29)
Difference (95 % CI) in kg/cm2 0.45 (0.11–0.80) 0.82 (0.09–1.54) 0.55 (0.25–0.85)
Change in proportion 14.60 % (3.09–26.12) 14.30 % (2.11–26.49) 14.52 % (5.76–23.29)
P value 0.011 0.030 0.001
  1. CI (Confidence Interval) Change in proportion (mean of (individual difference divided by the individual pre-intervention value))