sustained [Adjective] + improvement [Noun]

Strength Strength Dispersion
A:
5
CHISQ:
17.01
AWT:
25,235,207
TTEST:
1.81
G2:
11.91
FAWT:
2.15
MI:
2.38
LOGLOG:
5.53
JD:
0.56
MI3:
7.02
DICE:
0.14
RANGE: