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. Author manuscript; available in PMC: 2015 Jun 5.
Published in final edited form as: Birth Defects Res A Clin Mol Teratol. 2012 Aug 18;94(12):1033–1043. doi: 10.1002/bdra.23050

Table 1.

LD Case Groups Included in Current Analysis, the NBDPS 1997 to 2007

All Isolated
LD case groups No. % No. %
All LDs 844 100 619 100
Longitudinal 324 38.4 178 28.8
Longitudinal preaxial 194 23.0 73 11.8
Transverse 488 57.8 413 66.7
Intercalary 39 4.6 33 5.3
Other 19 2.3 13 2.1

LD, limb deficiency; NBDPS, National Birth Defects Prevention Study.