Transition into daylight saving time influences the fragmentation of the rest-activity cycle

Table 3 Changes due to transition into DST among morning and intermediate types

Variable	Mean	SD	P value
Morning types
IS	-0.16	0.14	0.1
IV	+0.05	0.31	0.5
RA	+0.01	0.02	0.9
tau	+16.00	17.66	0.1
Intermediate types
IS	-0.03	0.08	0.2
IV	-0.04	0.15	0.6
RA	+0.01	0.02	0.9
tau	-1.00	11.66	0.2

Abbreviations: SD = standard deviation, IS = intra-daily stability, IV = intra-daily variability, RA = relative amplitude, tau = circadian period.