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Table 2 Comparison of APrON and AOB selection criteria

From: Comparison of sample characteristics in two pregnancy cohorts: community-based versus population-based recruitment methods

Selection criteria APrON AOB-OC AOB-PC
Maternal age ≥16 years ≥18 years ≥18 years
Language Able to complete questionnaires in English Able to complete questionnaires in English Able to complete questionnaires in English
Gestational age at enrollment <27 weeks <24 wks <17wks
Specific criteria Not planning to move out of the city within 6 months of inclusion into study Receiving prenatal care Nulliparous or primiparous OR personal or familial history of preterm birth;
Receiving prenatal care;
Singleton pregnancy