Table 2

Simple linear regression analysis (R²) of mean performance for each shift in the young and older subjects

	Day shift 1	Day shift 2	Night shift 1	Night shift 2
Young	0.17	0.08	−0.43^2-150	−0.06
Older	0.75^2-150	0.54^2-150	−0.54^2-150	−0.31^2-150

↵2-150 p<0.05.