调查结果 Group discovery dataset validation dataset delivery outcome preterm term preterm term subjects 11 Mean maternal age (range) 28(19-39)30(19-41)34(27-45)31.8(29-37) Antibiotic use 4 during gestation Nulliparity 2 4 5调查结果 Group discovery dataset validation dataset delivery outcome preterm term preterm term subjects 11 29 4 5 Mean maternal age (range) 28 (19-39) 30 (19-41) 34 (27-45) 31.8 (29-37) Antibiotic use during gestation 4 8 0 0 Nulliparity 2 4 2 5 4