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Table 4 Correlation of width and inter-bracket distance L with friction

From: Frictional resistance exerted by different lingual and labial brackets: an in vitro study

Group Mean friction
Mean width Mean distance L
Lower lingual Pearson correlation .339 -.404
Sig. (two-tailed) .144 .078
n 20 20
Lower labial Pearson correlation .306 -.164
Sig. (two-tailed) .249 .544
n 16 16
Upper lingual Pearson correlation .179 -.405
Sig. (two-tailed) .451 .077
n 20 20
Upper labial Pearson correlation .609- -.606-
Sig. (two-tailed) .012 .013
n 16 16
  1. Significant correlation only in Upper lingual group; statistical tendency between distance L and friction in both lingual groups (p < 0.05); with an increase in the value of width, friction increases r = 0.61, p < 0.05 (n = 16); with a decrease in the value of distance L, friction increases r = -0.61, p < 0.05 (n = 16).