Table 2 Impact of DA: unadjusted mean scores (s.d.), results and effect sizes (d) from the ANCOVA comparing the DA and C groups

	Group	n	T1	T2	F	P	d
Well-being
Anxiety (STAI-state)	DA	176	41.0 (11.4)	40.4 (11.3)
	C	174	38.3 (10.6)	37.3 (10.6)	1.90	0.17	0.10
Depression (CESD)	DA	176	9.3 (8.6)	8.7 (8.9)
	C	175	8.1 (7.6)	7.5 (7.3)	0.02	0.89	0.01
Cancer related distress (IES)	DA	169	19.9 (14.7)	18.6 (15.0)
	C	174	17.6 (13.1)	16.3 (14.2)	0.14	0.71	0.03
General health	DA	173	7.3 (1.7)	7.4 (1.5)
	C	172	7.7 (1.5)	7.6 (1.6)	0.25	0.62	0.04
Decision related outcomes
Valuation of PM	DA	164	5.1 (2.6)	5.6 (2.5)
	C	160	4.8 (2.5)	5.0 (2.6)	4.41	0.04	0.17
Valuation of BS	DA	165	7.2 (2.5)	6.5 (2.5)
	C	162	7.5 (2.2)	7.4 (2.1)	14.86	0.00	−0.30
Valuation of PO	DA	161	6.9 (2.3)	7.4 (2.2)
	C	160	6.7 (2.6)	6.9 (2.5)	4.29	0.04	0.16
Valuation of OS	DA	160	5.9 (2.8)	4.9 (2.5)
	C	159	6.3 (2.9)	6.0 (2.7)	15.64	0.00	−0.31
Strength of treatment preference	DA	150	2.7 (1.1)	2.6 (1.0)
	C	150	2.7 (1.1)	2.7 (1.0)	1.38	0.24	−0.10
Decision uncertainty	DA	157	2.7 (1.1)	2.6 (0.9)
	C	162	2.8 (1.1)	2.7 (1.0)	1.20	0.27	−0.09
Preference for decision-making	DA	155	3.7 (0.6)	3.8 (0.6)
	C	159	3.5 (0.6)	3.7 (0.6)	1.46	0.23	−0.10
Information related outcomes variables
Subjective knowledge	DA	176	6.1 (1.5)	6.8 (1.3)
	C	174	6.1 (1.5)	6.3 (1.4)	22.31	0.00	0.36
Amount of received information	DA	171	^*	3.2 (0.9)
	C	166	^*	2.5 (1.0)	50.37	0.00	0.54
Satisfaction quality information	DA	176	^*	3.8 (0.9)
	C	171	^*	3.2 (1.0)	28.48	0.00	0.40

C: control; PM: prophylactic mastectomy; BS: breast cancer screening; PO: prophylactic oophorectomy; OS: ovarian cancer screening;
^*not measured at baseline (T1).

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