. Author manuscript; available in PMC: 2010 Jul 6.

Published in final edited form as: Hum Factors. 2009 Oct;51(5):652–668. doi: 10.1177/0018720809352654

TABLE 3.

Summary of Experiment 1 Postfeedback Questionnaire

Target Skill	Age Group	Response Distribution^a						Significance^b
Target Skill	Age Group	1	2	3	4	5	Average	Significance^b
When stopped, look both ways (primary look)	Older (70–89)	0	0	4	7	7	4.17	U = 102.5^*
When stopped, look both ways (primary look)	Younger (25–55)	0	0	11	3	4	3.61	U = 102.5^*
Take second look after starting turn (secondary look)	Older (70–89)	0	0	2	8	8	4.33	U = 100.0^*
Take second look after starting turn (secondary look)	Younger (25–55)	0	0	8	6	4	3.78	U = 100.0^*
Increase speed if little time available to make turn	Older (70–89)	0	1	5	6	6	3.94	U = 87.5^*
Increase speed if little time available to make turn	Younger (25–55)	0	1	12	5	0	3.22	U = 87.5^*
Scan far to left and right when approaching crosswalk	Older (70–89)	0	0	6	7	5	3.94	U = 117.5
Scan far to left and right when approaching crosswalk	Younger (25–55)	0	0	11	4	3	3.55	U = 117.5
Turn head and glance into target lane before changing lanes	Older (70–89)	0	0	4	7	7	4.17	U = 101.0^*
Turn head and glance into target lane before changing lanes	Younger (25–55)	0	0	10	5	3	3.61	U = 101.0^*

Response types: 1 = much less often, 2 = less often, 3 = about the same, 4 = more often, 5 = much more often.

Mann-Whitney U, n1 = 18 older participants and n2 = 18 younger participants in each analysis.

p < .05.