Figure 1.

Comparison of mean attitude ratings on the survey by actual reward frequency.

^a Responses on a 1-7 scale with 1 = not at all and 7 = very much.

^b Responses on a 1-7 scale with 1 = not important at all and 7 = very important.

^c Responses on a 1-7 scale with 1 = very negative and 7 = very positive.

^d Responses on a 1-7 scale with 1 = no impact at all and 7 = extremely large impact.

^e Responses on a 1-7 scale with 1 = not at all likely to refer a friend and 7 = extremely likely to refer a friend.