Table 4. DMS analysis of mean comparison for age and mastery variables.

Factors and ranges	Attention	Clarity	Repair	IEP
Age (years)
21 to 30	29.40 A1	29.87 C	31.04 C	90.33 A
31 to 40	27.92 B	30.55 BC	31.79 C	90.26 A
41 to 50	27.33 B	31.18 AB	32.20 AB	90.72 A
Over 50	28.32 AB	32.07 A	32.82 A	93.21 A
Mastery
Education	26.79 B	30.26 B	31.65 A	88.71 B
Basic education	28.37 B	30.84 B	31.82 A	91.04 B
Early education	29.56 A	31.66 A	32.41 A	93.64 A

Note: Means with the same letter (A, B, C) in each column indicate that there are no statistically significant differences between them, according to the DMS Test criteria at a significance level of p<0.05.