Table 1: Basic characteristics of the biofeedback group and the control group.

BiofeedbackControl value
()()

AgeM = 34.9 M = 33.20.37a
GPA3.523.600.24a
Gender
 Female97%97%0.75b
 Male3%3%
Year in school
 1st50%40%0.053b
 2nd30%13%
 3rd7%27%
 4th13%7%
 5th0%13%
Family income
 Good17%3%0.06b
 Moderate83%83%
 Poor0%13%
Health problems
 Yes17%23%0.37b
 No83%77%

M, mean; aby independent -test; bby chi-square test or Fisher’s exact test.