number of fetuses with skeletal variations to total number of fetuses ratio number of fetuses without an ossified first cervical vertebral body to total number of fetuses ratio 2021-08-09T15:46:39Z CMO:0003835 PMID:3347907 This is a calculated measurement in which the number of fetuses without an ossified first cervical vertebral body is divided by the total number of fetuses in the prospective litter, and the result presented as a ratio, fraction, quotient or percentage. clinical_measurement_ontology percent of fetuses without an ossified first cervical vertebral body percent of fetuses without ossification of the first cervical vertebral body slaulede