TABLE 3.

The Effect of Numeracy, Preference for Numbers, and Key Experimental Manipulations on Willingness to Participate; Summary Results of Multivariable Linear Regression Modes.

	Numerator d.f.	First vignette	All vignettes
Risk (1= one in ten, 2 = one in a million, 3 = no chance, 4 = no mention)	3	F = 13.5, p < .0001	F = 112.36, p < .0001
Sensitivity (1 = high, 0 = low)	1	F = 844.53, p < .0001	F = 14671.6, p < .0001
Prime (1 = privacy, 0 = computers)	1	F = 38.47, p < .0001	F = 41.78, p < .0001
Incentive (1 = high, 0 = low)	1	F = 8.25, p = .0041	F = 12.99, p = .0003
Mode (1 = FTF, 0 = mail)	1	F = 7.34, p = .0068	F = 17.15, p < .0001
Vignette number	1		F = 97.68, p < .0001
Same score	1		F = 510.62, p < .0001
Preference for words or numbers	1	F = 7.26, p = .0071	F = 0.62, p = .43
Numeracy	1	F = 2.97, p = .085	F = 41.6, p < . 0001
Risk*numeracy	3	F = 2.33, p = .073	F = 24.42, p < . 0001
Denominator d.f.		6355	44,302