Table VII.

Mean Difference for Safety Beliefs: 12 versus 40 ppb and Graded versus Plain Image

Safety belief differences	No OTB		OTB
	Time 1 Mean SE	Time 2 Mean SE	Time 1 Mean SE	Time 2 Mean SE
40 ppb minus 12 ppb
AN n = 35NB; n = 53B	0.81* .302	0.47 .295	0.85** .272	0.80** .263
Plain n = 34NB; n = 55B	0.15 .265	0.06 .226	1.13*** .247	0.88*** .251
Graded, n = 30NB; n = 54B	0.67* .259	0.67** .220	0.37 .316	0.69** .257
Graded minus Plain
12 ppb n = 35NB; n = 52B	−0.32 .240	−0.50* .194	0.22 .296	0.22 .279
40 ppb n = 29NB; n = 57B	0.20 .290	0.22 .257	−0.54 .272	0.03 .230

NB = No STB

B = STB

^*Significance based on Independent T-test; p < .05;

^**p < .01;

^***p < .001