Table 4.

Mother-infant dyads who completed infancy assessments to age 2 years ( N  = 1061) compared with those infants lost to follow-up ( N  = 597)

	Followed-up	Lost to follow-up
	Mean (SD)	Mean (SD)
Birthweight (kg)	3.50 (0.54)	3.44 (0.55)
Gestational age (weeks)	39.8 (1.6)	39.7 (1.7)
Maternal age (years)	33.7 (4.3)	32.8 (4.6)
Caucasian ethnicity	97%	92%
Spontaneous vaginal delivery	58%	60%
Primiparous	43%	43%
Index of multiple deprivation	8.9 (3.6)	9.0 (2.2)
Exclusively breastfed at 3 months	43%	40%