Improved eating behaviours mediate weight gain prevention of young adults: moderation and mediation results of a randomised controlled trial of TXT2BFiT, mHealth program

Table 1 Participants’ baseline characteristics identified as potential moderators and moderated intervention effects on weight change at 3- and 9-months

Baseline characteristic	Control (n = 125)		Intervention (n = 123)^a		Moderated effect on weight at 3-months			Moderated effect on weight at 9-months
	n	%	n	%	Diff	SE	P	Diff	SE	P
Age category
18–24 years	38	30.4	36	29.3	−1.1	0.6	0.04	−1.6	1.0	0.65
25–29 years	39	31.2	27	22.0	−3.2	0.7		−2.8	1.0
30–35 years	48	38.4	60	48.8	−1.5	0.5		−2.5	0.8
Gender
Female	79	63.2	73	59.3	−1.1	0.4	0.01	−1.3	0.7	0.02
Male	46	36.8	50	40.7	−2.8	0.5	0.01	−3.8	0.8	0.02
Socioeconomic status
1st, 2nd & 3rd quintiles^b	7	5.6	8	6.5	−0.7	1.4	0.40	−3.5	2.1	0.06
4th & 5th quintiles^c	118	94.4	115	93.5	−1.9	0.3	0.40	−2.3	0.5	0.06
Ethnicity
English	90	72.0	82	66.7	−2.2	0.4	0.08	−2.3	0.6	0.79
Other	35	28.0	41	33.3	−0.9	0.6	0.08	−2.0	0.9	0.79
Education level
High school or below	21	16.8	27	22.0	−0.8	0.8	0.35	−1.6	1.2	0.81
Some university or technical school	25	20.0	22	17.9	−1.9	0.8		−2.2	1.2
University bachelor degree or higher	79	63.2	74	60.2	−2.1	0.4		−2.5	0.7
Income (AU$)
<$AUS 80,000	94	75.2	100	81.3	−1.4	0.4	0.02	−1.9	0.6	0.20
>$AUS 80,000	31	24.8	23	18.7	−3.2	0.7	0.02	−3.5	1.1	0.20
Recruitment source^d
GP letter	31	25.4	37	31.1	−1.3	0.6	0.64	−1.7	1.0	0.56
Print Media	39	32.0	30	25.2	−1.6	0.6		−3	1.0
Electronic media	52	42.6	52	43.7	−2	0.5		−1.8	0.8
Significant other
Yes	68	54.4	76	61.8	−2.2	0.4	0.14	−2.5	0.7	0.79
No	57	45.6	47	38.2	−1.2	0.5	0.14	−2.2	0.8	0.79
Living situation
Alone	16	12.8	12	9.8	−2.5	1.0	0.47	−2.4	1.6	0.92
Not alone	109	87.2	111	90.2	−1.7	0.4	0.47	−2.3	0.6	0.92
Interventionist
Dietitian 1	74	59.2	77	61.6	−2.1	0.4	0.31	−2.6	0.7	0.51
Dietitian 2	51	40.8	48	38.)	−1.4	0.5	0.31	−1.9	0.8	0.51

AU$ Australian Dollars, Diff difference, GP general practitioner, SE standard error; ^aAll participants had measured variables excluding two participants who did not complete baseline self-report surveys; ^bLowest quintiles; ^cHighest quintiles; ^dSeven participants (three control, six intervention) did not recall their recruitment source and were excluded from the moderation analysis on recruitment source

ISSN: 1479-5868