Table 3 Impact of timing of DA: unadjusted mean scores (s.d.), results and effect sizes (d) from the ANCOVA comparing the DA_b and the DA_a groups

	Group	n	T1	T3	F	P	d
Well-being
Anxiety (STAI-state)	DA_b	45	40.3 (10.8)	40.9 (12.9)
	DA_a	40	37.8 (11.5)	40.2 (12.4)	0.25	0.62	−0.08
Depression (CESD)	DA_b	45	7.7 (7.2)	11.2 (11.0)
	DA_a	39	8.6 (8.8)	9.4 (9.4)	2.42	0.12	0.24
Cancer related distress (IES)	DA_b	44	18.4 (13.5)	22.6 (15.7)
	DA_a	40	17.3 (13.1)	20.3 (13.9)	0.36	0.55	0.09
General health	DA_b	43	7.8 (1.5)	7.4 (1.9)
	DA_a	37	8.0 (1.5)	7.7 (1.7)	0.23	0.63	−0.08
Decision related outcomes
Valuation of PM	DA_b	44	5.0 (2.4)	5.6 (2.5)
	DA_a	39	4.0 (2.4)	4.7 (2.7)	0.02	0.89	0.02
Valuation of BS	DA_b	44	7.3 (2.4)	6.3 (2.3)
	DA_a	39	8.2 (1.6)	7.4 (2.1)	1.16	0.29	−0.17
Valuation of PO	DA_b	41	6.7 (2.7)	7.3 (2.6)
	DA_a	38	5.8 (2.8)	6.5 (2.5)	0.09	0.77	0.05
Valuation of OS	DA_b	41	5.6 (2.9)	4.7 (2.8)
	DA_a	38	7.2 (2.5)	6.2 (2.8)	0.80	0.38	−0.14
Strength of treatment preference	DA_b	40	2.8 (1.2)	3.1 (0.8)
	DA_a	36	2.6 (1.1)	2.8 (1.0)	0.64	0.43	0.13
Decision uncertainty	DA_b	43	2.5 (1.1)	2.1 (0.9)
	DA_a	38	2.7 (1.1)	2.4 (1.0)	0.29	0.59	−0.08
Preference for decision-making	DA_b	42	3.8 (0.6)	3.8 (0.7)
	DA_a	37	3.5 (0.6)	3.6 (0.7)	0.17	0.69	−0.06
Information related outcomes variables
Subjective knowledge	DA_b	45	6.2 (1.8)	7.1 (1.3)
	DA_a	40	6.1 (1.5)	6.8 (1.4)	0.83	0.37	0.14
Amount of received information	DA_b	43	^*	3.3 (0.9)
	DA_a	40	^*	3.3 (0.9)	0.25	0.62	0.08
Satisfaction quality information	DA_b	45	^*	3.9 (1.0)
	DA_a	38	^*	3.7 (0.9)	1.01	0.32	0.15

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

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