Table 2.

Motives for participation in and potential withdrawal from a Dutch population-based biobank.

	M	SD	Loading
Motives of participation—societal benefits	4.06	0.50	(α = 0.83)
I contribute to the health of future generations by participating	4.23	0.59	0.74
I contribute to health care by participating	4.14	0.55	0.91
I contribute to science by participating	4.10	0.57	0.84
I contribute to society by participating	3.77	0.74	0.55
Motives of participation—individual benefits	2.92	0.80	(α = 0.84)
I learn about myself by participating	3.86	0.75	–
I perceive participation as moral duty	3.22	0.97	0.47
I have fun by participating	2.89	0.95	0.74
People I know participate	2.71	1.21	–
I feel proud by participating	2.65	0.99	0.96
Motives of withdrawal—societal harm	3.94	0.84	(α = 0.77)
The research organisation becomes a for-profit organisation	3.98	0.89	0.87
The research organisation starts active collaboration with commercial enterprises	3.91	0.93	0.83
The research does no longer contribute to health care	3.65	0.85	–
Motives of withdrawal—individual harm	3.49	0.64	(α = 0.61)
I have a negative experience during a visit	3.58	0.87	0.67
The research organisation gets negative news reports	3.51	0.83	–
De time investment becomes too high	3.48	0.91	0.59
The research aim changes	3.41	0.78	0.42

The values in the table are probability (p) with standard deviation (SD), and reliability statistic Cronbach’s alpha (α). Loadings of items with communalities <0.30 are not reported (–), and were left out in further analyses.