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Table 1 Descriptive statistics of conditions during therapy including ABO scores

From: Clinical effects with customized brackets and CAD/CAM technology: a prospective controlled study

  Total Group 1 Group 2 p Values
(1–2)
Effect size
Patients [n (%)] 38 (100) 18 (47.4) 20 (52.6)   
Sex [n (% of total)]      
 Male 15 (39.5) 8 (21.1) 7 (18.4) 0.741a 0.097c
 Female 23 (60.5) 10 (26.3) 13 (34.2)
Age at the start of treatment (years) 14.3 [12.4; 22.2] 14.3 [13.1; 18.5] 14.3 [12.4; 22.2] 0.696b 0.044d
Little Irregularity Index 3.6 [0.5; 13.0] 4.7 [0.5; 8.0] 2.7 [1.6; 13.0] 0.051b 0.438d
Treatment time (months) 16.7 [10.1; 35.2] 16.7 [13.0; 30.1] 16.8 [10.1; 35.26] 0.654b 0.084d
Number of brackets lost 1.0 [0; 19] 2.0 [0; 19] 1 [0; 3] 0.035b 0.813d
Number of brackets repositioned 0 [0; 10] 0 [0; 5] 0.5 [0; 10] 0.024b 0.611d
Number of archwires 4.5 [3; 6] 6 [3; 6] 4 [3; 6]  < 0.001b 1.3d
Number of archwire bends 2.5 [0; 14] 2 [0; 5] 5 [0; 14] 0.093b 0.789d
Number of appointments 15.0 [8; 28] 16.5 [10; 28] 14 [8; 25] 0.082b 0.494d
ABO scores before treatment 46 [30; 62] 46 [30; 62] 48 [32; 62] 0.874b 0.105d
ABO scores after treatment 13 [3; 24] 12 [3; 23] 16 [7; 24] 0.133b 0.442d
ABO score change within treatment 32 [16; 53] 32 [20; 53] 32 [16; 48] 0.806b 0.248d
  1. If not otherwise stated, median and range [minimum; maximum] were reported including effect sizes. The Mann–Whitney U test was applied to compare both groups: group 1 (individualized CAD/CAM system) and group 2 (conventional self-ligating system)
  2. aFisher’s exact test, bexact significance Mann–Whitney U test, cCohen’s w, dCohen’s d