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. Author manuscript; available in PMC: 2011 Jul 25.
Published in final edited form as: Oral Dis. 2008 Jul;14(5):419–427. doi: 10.1111/j.1601-0825.2007.01394.x

Table 4.

Root/crown ratio of posterior teeth, DC patients and IBMFS family controls

Controls DC patients
Sex Age Number of teeth below published norms* Age Number of teeth below published norms*
Female 41 1/16 46 2/15
Male 14 1/16 15 0/16
Male 31 1/15 25 9/16
Male 29 2/16 29 6/9
Male 21 0/14 22 5/16
Male 16 0/16 19 9/16
Male 24 0/16 22 16/16
Male 13 2/16 13 4/4 **

DC, dyskeratosis congenita

*

Abnormal = Less than normal mean – 2 s.d. The difference between the proportion of teeth with decreased root/crown ratios in the DC group and control group is significant, P <0.003 (unpaired t test). Not all posterior teeth could be evaluated.

**

Other posterior teeth had orthodontic brackets.