A prospective  survey, carried out in the Quebec City. This study substantiates that several risk factors of spontaneous preterm labour cannot be modified (previous intra uterine growth restriction, previous preterm labour) while others may respond to targeted interventions (BMI before  conception, screening and appropriate treatment of  urinary tract infections, avoidance of strenuous working conditions together with initiating appropriate intervensions and/or counselling when anxiety and stressful life events occur during pregnancy)