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Table 1 Differences in patient characteristics and measurements according to the presence of cervical myelopathy

From: Predictors of cervical myelopathy and hydrocephalus in young children with achondroplasia

Characteristics and parametersa Yes No p value
N 13 52  
Sex
 Male 8 (62) 28 (54) 0.85
 Female 5 (38) 24 (46)  
Age (months) 11.7 ± 6.1 14.6 ± 9.3 0.29
Follow up period (months) 31.0 ± 22.3 41.8 ± 23.8 0.15
FM AP (mm) 6.06 ± 1.66 9.10 ± 2.22  < 0.001
Cord constriction ratio 0.37 ± 0.19 0.16 ± 0.12  < 0.001
Anterior indentation
 0 0 (0) 24 (46)  < 0.001
 1 3 (23) 21 (40)  
 2 10 (77) 7 (14)  
Posterior indentation
 0 0 (0) 38 (73)  < 0.001
 1 7 (54) 8 (15)  
 2 6 (46) 6 (12)  
Indentation index
 0 0 (0) 22 (42)  < 0.001
 1 0 (0) 15 (29)  
 2 3 (23) 8 (15)  
 3 4 (31) 4 (8)  
 4 6 (46) 3 (6)  
Frontal horn width (mm) 43.94 ± 11.04 40.61 ± 7.88 0.22
BPD (mm) 141.17 ± 7.46 136.40 ± 8.34 0.06
Evans ratio 0.31 ± 0.07 0.30 ± 0.06 0.51
Periventricular HSI 22.09 ± 20.33 11.46 ± 11.92 0.02
FMD
 Yes 12 (92) 9 (17)  
 No 1 (8) 43 (83)  
VP shunt
 Yes 0 (0) 1 (2)  
 No 13 (100) 51 (98)  
Later event
 Yes 0 (0) 2 (4) 1.00
 No 13 (100) 50 (96)  
  1. FM Foramen magnum, AP anterior–posterior diameter, BPD bi-parietal diameter, HSI high signal intensity, FMD foramen magnum decompression, VP ventriculo-peritoneal
  2. aData are presented as n (%) or mean ± SD