Table III.

Values of Cronbach’s α coefficient in the first measurement (test) and retest (after 14 days) for the entire scale and individual parts (I and II)

Variable	Cronbach’s α (95% CI)	N
IBD-F (whole) – test	0.968 (0.95–0.98)	48
IBD-F (whole) – retest	0.975 (0.97–0.98)	78
IBD-F part I – test	0.883 (0.85–0.92)	119
IBD-F part I – retest	0.898 (0.86–0.93)	101
IBD-F part II – test	0.966 (0.95–0.98)	50
IBD-F part II – retest	0.971 (0.96–0.98)	80

95% CI – 95% confidence interval, N – number of complete answers.