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Table 2 Occlusal characteristics (overjet, increased overjet, overbite, anterior open bite, primary canine relationship, posterior crossbite) in all children according to group

From: Occlusal characteristics in 3-year-old children – results of a birth cohort study

  All children n = 377 Group I (norm) n = 44 Group II (pacifier) n = 304 Group III (thumb) n = 16 Group IV (other) n = 13
Overjet
 Mean overjet ± SD (mm) 2.4 ± 0.8 1.2 ± 0.2 2.6 ± 0.7 3.3 ± 0.4 1.3 ± 0.6
Increased overjet N (%) 155 (41.2) 0 (0.0) 138 (45.4) 16 (100.0) 1 (7.7)
 Mean ± SD 3.2 ± 0.3 3.2 ± 0.3 3.3 ± 0.4 3.6 ± 0.0
Overbite
 Mean overbite ± SD (mm) 0.8 ± 1.2 1.4 ± 0.2 0.8 ± 1.2 −0.3 ± 2.1 1.3 ± 0.1
Anterior open bite N (%) 41 (10.9) 0 (0.0) 35 (11.5) 6 (37.5) 0 (0.0)
 Mean ± SD 2.2 ± 1.4 3.4 ± 1.9 −2.6 ± 1.7
\( {\scriptscriptstyle \raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$3$}\right.} \) overlap N (%) 212 (56.2) 21 (47.7) 174 (57.2) 10 (62.5) 7 (53.8)
\( {\scriptscriptstyle \raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$3$}\right.} \) to \( {\scriptscriptstyle \raisebox{1ex}{$2$}\!\left/ \!\raisebox{-1ex}{$3$}\right.} \) overlap N (%) 123 (32.6) 23 (52.3) 95 (31.3) 0 (0.0) 5 (38.5)
> \( {\scriptscriptstyle \raisebox{1ex}{$2$}\!\left/ \!\raisebox{-1ex}{$3$}\right.} \) overlap N (%) 1 (0.3) 0 (0.0) 0 (0.0) 0 (0.0) 1 (7.7)
Primary canine relationship
 Class I N (%) 223 (59.2) 44 (100.0) 162 (53.3) 5 (31.2) 12 (92.3)
 Class II N (%) 154 (40.8) 0 (0.0) 142 (46.7) 11 (68.8) 1 (7.7)
 Class III N (%) 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0)
Posterior crossbite
 Unilateral N (%) 13 (3.4) 0 (0.0) 12 (3.9) 1 (6.2) 0 (0.0)
 Bilateral N (%) 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0)