Recruiting and engaging new mothers in nutrition research studies: lessons from the Australian NOURISH randomised controlled trial

Table 3 Characteristics of N =2094 mothers who consented at Stage 1 and were Allocated ( n =698) or Not allocated ^a ( n =1396)

Variable ^b	Allocated (n=698)	Not allocated (n=1396) ^a		Difference ^cpvalue
	Consented	Did not Consent (n=885)	Could not recontact (n=511)
	Mean ± SD or %(n)
Maternal age at delivery (years)^d (n=2087)	30.1 ± 5.3	28.0 ± 5.5	26.2 ± 5.5	<.001
Maternal education (University degree)^e (n=2078)	58 (406)	36 (311)	27 (137)	<.001
Born in Australia/New Zealand^e	78 (542)	77 (667)	75 (376)	.3
Married/Defacto^e (n=2062)	95 (659)	90 (778)	83 (421)	<.001
Intend to breastfeed exclusively^e (n=2088)	93 (652)	90 (794)	87 (441)	<.001
Smoked during pregnancy^e (n=2081)	12 (85)	21 (185)	32 (164)	<.001

(n values) reflect missing data.
^a excluding an additional 75 participants who became ineligible.
^b based on data provided at Stage 1.
^c comparison between Allocated vs. Not allocated.
^d based on independent samples t test; Mean ± standard deviation (SD) reported.
^e based on likelihood ratio chi-square test; proportion % (count) reported.

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