Main outcome
SE, pain
The main outcome in this study was pain intensity measured with a 0–10 VAS scale. The measurements were taken pre- and post-test before the start of the intervention and after four weeks (Tables 
Results experimental group*Statistically significant difference. SD: Standard Deviation VAS: Visual Analogue Scale. RMQ: Roland-Morris Questionnaire. TrA: Abdominal Transverse Muscle. PBU: Pressure Biofeedback Unit. US: Ultrasound. EMG: Electromyography
Results control group*Statistically significant difference. SD: Standard Deviation VAS: Visual Analogue Scale. RMQ: Roland-Morris Questionnaire. TrA: Abdominal Transverse Muscle. PBU: Pressure Biofeedback Unit. US: Ultrasound. EMG: ElectromyographyA two-way mixed ANOVA was conducted to examine the effects of time and treatment on pain intensity. The interaction effect between time and treatment on pain intensity was statistically significant (F(1, 33) = 14.33, p = 0.001, η2 = 0.3). There was a significant main effect of the intervention (differences between the measurements pre- and post-intervention) on pain intensity (F(1, 33) = 18.4, p = 0.00, η2 = 0.36). For the experimental group, pain intensity was significantly decreased post-test compared to pre-test (MD -2.12; CI 95% -2.9 to -1.33; p = 0.00) (Table 
Comparative resultsVAS(0–10)Control (19)Experimental (16)-2.1 (0.38)-0.1 (0.35)RMQ(0–24)Control (19)Experimental (16)0.7 (0.8)-3.8 (0.87)Control (19)Experimental (16)-0.6 (0.37)2.5 (0.4)Control (19)Experimental (16)-0.22 (0.1)0.74 (0.2)Control (19)Experimental (16)-0.001 (0.009)0.009 (0.01)*Statistically significant difference. SE: Standard Error. CI: Confidence Interval. VAS: Visual Analogue Scale. RMQ: Roland-Morris Questionnaire. TrA: Abdominal Transverse Muscle. PBU: Pressure Biofeedback Unit. US: Ultrasound. EMG: Electromyography. Partial Eta squared, F and p-values were calculated using a two-way mixed ANOVA