Table 1.

Primary objective in PICO format

	Primary objective
Population	Mothers of one or two infants born between 23+0 and 31+6 weeks’ post-menstrual age
Intervention	Provision of specific relaxation and visualisation recording with instruction to listen frequently while expressing breastmilk
Control	Standard care, including standard lactation support provided by neonatal unit staff
Outcome	Expressed milk yield in 24 h (highest value recorded on any of day 4, day 14 or day 21 after birth)