Table 2: Within-group distribution of conceptual perception of phlegm pattern.

Year of studyFirst yearSecond yearThird yearFourth yearFifth year value

Mean 6.79a6.65a5.98b6.43c6.36c<0.001
SD of 1.572.341.181.431.26
Mean 4.724.624.184.494.440.093
SD of 1.241.190.921.121.00

SD: standard deviation.
: index of a student.
abcIndicators of the homogeneous subsets grouped by Dunnett’s test.