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Table 3 T -Test to detect differences in treatment time by degree of treatment complexity, but with no breakdown by appliance type

From: Lingual orthodontic treatment duration: performance of two different completely customized multi-bracket appliances (Incognito and WIN) in groups with different treatment complexities

  Mean (SD) - S1 Mean (SD) - S2 p - 2-sided N - S1 N - S2
Treatment duration [Months] 20.51 (6.59) 28.21 (6.95) <0.0001 317 59
  1. Treatment duration was significantly longer in subjects classified as having a ‘severe’ type of malocclusion.