The incidence of complications related to preterm infants: respiratory distress syndrome (80%), chronic lung disease (9.3%), symptomatic patent ductus arteriosus (14.4%), late-onset sepsis (58.6%), late-onset pneumonia (40.5%), necrotising enterocolitis (7%), retinopathy of prematurity treated by diode laser photocoagulation (1.4%), intraventricular / periventricular haemorrhage (5.6%).