Table 4.

Stepwise linear regression analysis with parental intentions about genetic testing of their child as outcome variable and background characteristics (step 1), need factors (step 2), health belief factors (step 3), attitude factors (step 4) and interactions (step 5) as independent variables (N = 705)

	∆R2 = 0.122**	∆R2 = 0.030**	∆R2 = 0.057**	∆R2 = 0.399**	∆R2 = 0.012**
	Step 1 (β)	Step 2 (β)	Step 3 (β)	Step 4 (β)	Step 5 (β)
Background characteristics
Gender of the parent (female/male)	−0.01	−0.01	−0.00	0.04	0.03
Parent’s age (range 20–59)	0.04	0.02	0.04	0.02	0.03
Parental education
High vs low	−0.14**	−0.13**	−0.10*	−0.01	−0.01
Intermediate vs low	−0.07	−0.06	−0.06	−0.02	−0.04
Ethnicity (Turkish/Dutch)	0.29**	0.25**	0.20**	0.03	0.04
Need
BMI parent (overweight/normal weight)		0.00	0.02	0.04	0.03
BMI child (overweight/normal weight)		0.06	0.03	0.04	0.03
Perceived child weight (−2 = far too high; 2 = far too low)		−0.11*	−0.02	0.02	0.02
Perceived parent weight (−2 = far too high; 2 = far too low)		−0.07	−0.03	−0.05	−0.06
Health beliefs about overweight
Perceived susceptibility (−2 = lowest, 2 = highest)			0.08	0.07*	0.03
Concern about child weight (−2 = lowest; 2 = highest)			0.18**	0.06	0.06
Belief genetics causes overweight (−2 = lowest; 2 = highest)			0.13**	0.03	0.03
Belief behaviour causes overweight (−2 = lowest; 2 = highest)			0.09**	0.00	0.00
Attitudinal factors regarding genetic testing
Attitude (−2 = lowest; 2 = highest)				0.59**	0.64**
Anticipated regret (−2 = lowest; 2 = highest)				0.16**	0.20**
Interactions
Attitude × parental education (high vs low)					−0.09**
Anticipated regret × ethnicity					−0.07*
Perceived susceptibility × parental education (low vs intermediate)					0.10*

β standardised regression coefficient; R² squared multiple correlation coefficient; ∆R² increase in R² from previous step to current step

*p < 0.05; **p < 0.01