Comparison of those who returned all 4 questionnaires and those who returned fewer than 4.

Tests for differences between those who returned all 4 questionnaires and those who returned fewer than 4:
For the number of diagnoses, U = 50464.5, p = 0.646, r = 0.02.
For anxiety scores at baseline, t(530) = 2.93, p = 0.003, d = 0.24 (df adjusted due to unequal variances).
For depression scores at baseline, t(640) = 0.94, p = 0.344, d = 0.07.
(a)The people who were eligible for the study were adults who had at least one chronic medical condition and took part in an educational program to enhance their ability and confidence to self-manage their chronic condition(s).
(b)Median (minimum, maximum). The minimum is the same as the median because many people (336, 52.3%) had only one diagnosis. For the distribution of number of diagnoses among all who were eligible for the study, skewness was 2.49.