number of fetuses with skeletal variations to total number of fetuses ratio number of fetuses with an ossified anterior arch of atlas to total number of fetuses ratio 2021-08-09T15:28:22Z CMO:0003834 PMID:3347907 This is a calculated measurement in which the number of fetuses with an ossified anterior arch of atlas 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 with an ossified anterior arch of atlas percent of fetuses with ossification of the anterior arch of atlas slaulede