Sleep disturbances, shift work, and epigenetic ageing in working-age adults: findings from the Young Finns study

Clinical Epigenetics

Table 1 Descriptive characteristics of the included population

	Proportion (%)	Mean (SD)	Range (min, max)
Age (2011)		42.04 (4.98)	34.00, 49.00
Sex (Female)	56.1
Health variables
Daily smoking status	14.3
Physical activity index		9.05 (1.88)	5.00, 15.00
Alcohol consumption		0.80 (1.19)	0.00, 14.29
BMI		26.59 (4.99)	17.47, 58.47
Hypertension, diagnosis	9.1
Systolic blood pressure		118.80 (13.91)	83.33, 178.67
Diastolic blood pressure		74.76 (10.47)	44.00, 113.33
Cardiovascular disease status	0.7
Diabetes	2.6
Socioeconomic variables
Years of education		15.32 (3.56)	8.00, 30.00
Gross annual income		7.37 (3.08)	1.00, 13.00
Irregular working hours	31.1
Sleep measures
Jenkins Sleep Scale (JSS)*		9.00 (3.62)	4.00, 24.00
Epworth Sleepiness Scale (ESS)*		5.43 (3.20)	0.00, 20.00
Sleep deprivation score		0.49 (0.74)	− 2.00, 4.00
Morningness-Eveningness Questionnaire (MEQ; shortened)*		12.98 (3.40)	6.00, 24.00
Measures of epigenetic ageing/pace of ageing
AgeDev_Pheno		0.11 (5.35)	− 17.47, 20.11
AgeDev_Grim		− 0.03 (3.70)	− 9.21, 16.14
AgeDev_Hannum		0.07 (4.17)	− 19.22, 14.17
AgeDev_Horvath		0.07 (4.18)	− 22.69, 19.49
DunedinPACE		0.94 (0.10)	0.61, 1.35

All participants included in at least one model were included in this table (n = 1618)
^*Sum variables (averaged from 2007 and 2011) reported, but variables used in analyses were averaged across items (JSS) or standardized item by item and averaged (ESS, MEQ). MEQ was coded so that larger values indicate later chronotypes

ISSN: 1868-7083