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Table 2 Measurement findings of PDL distance (μm)

From: Effects of 405-, 532-, 650-, and 940-nm wavelengths of low-level laser therapies on orthodontic tooth movement in rats

Group/variable Distance of PDL 95% confidence interval for mean p Group/variable Distance of PDL 95% confidence interval for mean p
Mean S.D. Lower bound Upper bound Mean S.D. Lower bound Upper bound
PDL-M NC 0.178 0.009 0.169 0.188 0.042* PDL-D NC 0.136 0.015 0.120 0.152 0.007*
PC 0.266 0.066 0.211 0.320 PC 0.225 0.048 0.185 0.266
405 nm 0.257 0.084 0.187 0.328 405 nm 0.198 0.060 0.148 0.248
532 nm 0.228 0.075 0.135 0.322 532 nm 0.179 0.018 0.157 0.202
650 nm 0.244 0.051 0.197 0.291 650 nm 0.218 0.063 0.161 0.276
940 nm 0.252 0.025 0.229 0.275 940 nm 0.153 0.029 0.127 0.180
Pairwise comparisons, p values
Group/variable NC-PC NC-405 nm NC-532 nm NC-650 nm NC-940 nm PC-405 nm PC-532 nm PC-650 nm PC-940 nm 405–532 nm 405–650 nm 405–940 nm 532–650 nm 532–940 nm 650–940 nm
PDL-M 0.002* 0.027* 0.097 0.015* 0.003* 0.599 0.462 0.728 1.000 0.769 0.817 0.816 0.684 0.371 0.798
PDL-D 0.010* 0.038* 0.017* 0.031* 0.315 0.206 0.028* 0.954 0.015* 0.607 0.416 0.082 0.062 0.088 0.035*
  1. PDL-M PDL distance in mesial-cervical, PDL-D PDL distance in distal-cervical, NC negative control group, PC positive control group, S.D. standard deviation
  2. Significant degree: *p < 0.05