Maternal recruits from fax and in-clinic were more likely to attend university ( Fax : 92.6 % , in-clinic 89.8 % ) versus the reference population ( 52.0 % ; p < 0.05 for both ) and both were less likely to smoke ( Fax : 6.8 % , in-clinic 4.2 % ) versus reference ( 18.6 % ; p < 0.05 for both ) .