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Table 1 Dentin phosphoprotein biomarker levels in the two study groups at the different time points

From: The effect of two different types of forces on possible root resorption in relation to dentin phosphoprotein levels: a single-blind, split-mouth, randomized controlled trial

  Continuous force Intermittent force Mean difference (SD) 95% CI WSR
P value
Week 0      
Mean ± SD 0.021 ± 0.009 0.020 ± 0.008 0.001 (0.01) − 0.01, 0.01 0.78
Median (IQR) 0.021 (0.012, 0.030) 0.021 (0.011, 0.028)    
Week 1      
Mean ± SD 0.388 ± 0.007 0.383 ± 0.005 0.005 (0.006) − 0.0007, 0.01 0.13
Median (IQR) 0.386 (0.383, 0.387) 0.383 (0.382, 0.385)    
Week 3      
Mean ± SD 0.384 ± 0.003 0.388 ± 0.005 − 0.004 (0.006) − 0.009, 0.0009 0.08
Median (IQR) 0.383 (0.383, 0.385) 0.389 (0.387, 0.392)    
Week 4      
Mean ± SD 0.375 ± 0.002 0.299 ± 0.08 0.07 (0.08) 0.007, 0.14 0.04*
Median (IQR) 0.375 (0.374, 0.375) 0.294 (0.267, 0.368)    
Week 5      
Mean ± SD 0.385 ± 0.004 0.340 ± 0.07 0.04 (0.07) − 0.01, 0.10 0.21
Median (IQR) 0.385 (0.382, 0.388) 0.367 (0.263, 0.394)    
Week 8      
Mean ± SD 0.391 ± 0.002 0.293 ± 0.09 0.10 (0.09) 0.02, 0.17 0.04*
Median (IQR) 0.391 (0.390, 0.392) 0.292 (0.202, 0.392)    
Mean difference (week 8–0)      
Mean ± SD 0.370 ± 0.01 0.273 ± 0.09 0.10 (0.09) 0.02, 0.18 0.04*
Median (IQR) 0.372 (0.360, 0.380) 0.271 (0.180, 0.373)    
Friedman test < 0.001* < 0.001*    
  1. WSR Wilcoxon signed rank test, SD standard deviation, CI confidence interval
  2. *Statistically significant at P value < 0.05