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Table 2 Duration of treatment [Months] in sub-groups of severities of malocclusion 1 (mild to moderate cases) and 2 (severe cases)

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

Severity Appliance N Means SD Min Max Median
S1 Incognito 171 22.69 6.99 3.26 41.89 22.14
S1 WIN 146 17.96 5.03 3.97 29.23 17.98
S2 Incognito 49 29.79 6.06 16.01 42.86 30.62
S2 WIN 10 20.49 5.96 11.97 28.97 19.53
All Groups   376 21.72 7.21 3.26 42.88 20.94
  1. The differences between WIN and Incognito were highly significant for both S1 (p < 0.0001) and S2 (p = 0.0006).