Table 4

Association between lifetime shift work (in years) and variables of the PCs previously associated with the respective lifetime, using linear regression analyses among 438 shift workers

Component, variable†	β	SE	p Value	R² (%)
PC2
RMSSD	−0.657	0.183	<0.000*	3.0
HF	−5.084	1.576	0.001*	2.3
LF	−2.370	1.338	0.077	0.7
PC3
SBP	0.406	0.178	0.025*	1.2
DBP	0.365	0.170	0.044*	1.3
PC4
HR	0.005	0.003	0.069	0.8
LF/HF	0.066	0.015	<0.000*	4.2
PC5
WHR	0.002	<0.000	<0.000*	3.1
FG	0.339	0.123	0.006*	1.7

†Dependent variable.
*p<0.05 was considered statistically significant after linear regression analyses.
DBP, diastolic blood pressure; FG, fasting glucose; HF, power in high-frequency range; HR, heart rate; LF, power in low-frequency range; LF/HF, ratio LF/HF; PC, principal component; R², coefficient of determination; RMSSD, root mean square of successive R-R interval differences; SBP, systolic blood pressure; WHR, waist-to-hip ratio.