ΔT (T₀ − T₂₈)

Sleeping on either side

ΔT (T₀ − T₂₈)

Sleeping on back or stomach

Mean of the differences

95% confidence interval

t-value

p-value

Average

Average

Low

Upper

Total wrinkle improvement

9.63

5.8

8.5

−67.3

−18.8

−5.66

0.0109^*