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Table 5 Associations between cardiometabolic health markers and wake-up time regularity at midlife in a population-based birth cohort (N = 3,698) according to multivariate linear regression analyses (Regression estimates for cardiometabolic health markers displaying a U-shaped relationship with wake-up time regularity are presented separately, stratified by ≤ 01:00:00 and > 01:00:00.)

From: Regularity of bedtime, wake-up time, and time in bed in mid-life: associations with cardiometabolic health markers with adjustment for physical activity and sedentary time

Cardiometabolic health markers

B [95% CI]

 p-value

Markers displaying a linear relationship wake− up time regularity

BMI (kg/m2)

Model 1

0.143 [0.032. 0.254]

0.012

 

Model 2A

0.102 [− 0.011, 0.215]

0.076

 

Model 2B

0.047 [− 0.065, 0.160]

0.41

SBP (mmHg)

Model 1

0.090 [− 0.067. 0.248]

0.261

 

Model 2A

0.086 [− 0.072, 0.243]

0.286

 

Model 2B

0.064 [− 0.092, 0.220]

0.423

DBP (mmHg)

Model 1

0.181 [0.029. 0.333]

0.020

 

Model 2A

0.150 [− 0.002, 0.303]

0.054

 

Model 2B

0.097 [− 0.055, 0.249]

0.213

Fasting insulin (mmol/L)

Model 1

0.034 [0.001. 0.067]

0.046

 

Model 2A

0.021 [− 0.012. 0.055]

0.210

 

Model 2B

0.005 [− 0.029. 0.038]

0.787

2− h insulin (mmol/L)

Model 1

0.049 [0.023. 0.076]

 < 0.001

 

Model 2A

0.039 [0.012. 0.066]

0.005

 

Model 2B

0.022 [− 0.005. 0.049]

0.114

2− h glucose (mmol/L)

Model 1

0.129 [0.053. 0.205]

0.001

 

Model 2A

0.107 [0.03. 0.184]

0.006

 

Model 2B

0.076 [− 0.001. 0.153]

0.052

Triglycerides (mmol/L)

Model 1

0.067 [0.025. 0.108]

0.002

 

Model 2A

0.051 [0.009. 0.093]

0.017

 

Model 2B

0.031 [− 0.011. 0.073]

0.152

Total/HDL cholesterol ratio

Model 1

0.018 [− 0.056. 0.093]

0.627

 

Model 2A

− 0.011 [− 0.086. 0.064]

0.776

 

Model 2B

− 0.041 [− 0.116. 0.034]

0.280

LDL/HDL cholesterol ratio

Model 1

0.009 [− 0.040. 0.059]

0.706

 

Model 2A

− 0.008 [− 0.057. 0.042]

0.756

 

Model 2B

− 0.026 [− 0.075. 0.023]

0.303

Body fat (%)

Model 1

0.081 [0.018. 0.145]

0.012

 

Model 2A

0.049 [− 0.017, 0.114]

0.144

 

Model 2B

− 0.001 [− 0.067, 0.066]

0.979

Markers displaying U− shaped relationship with wake− up time regularity

WC (cm)

Model 1

0.129 [− 0.064. 0.321]

0.19

Wake− up time regularity ≤ 1:00:00

Model 2A

− 0.067 [− 0.257, 0.124]

0.492

 

Model 2B

− 0.081 [− 0.272, 0.109]

0.401

WC (cm)

Model 1

0.214 [0.015. 0.413]

0.035

Wake− up time regularity > 1:00:00

Model 2A

0.120 [0.019, 0.22]

0.019

 

Model 2B

0.08 [− 0.021, 0.181]

0.118

Fasting glucose (mmol/L)

Model 1

0.213 [− 0.036. 0.463]

0.094

Wake− up time regularity of ≤ 1:00:00

Model 2A

0.021 [− 0.204, 0.247]

0.852

 

Model 2B

0 [− 0.225, 0.226]

0.997

Fasting glucose (mmol/L)

Model 1

0.080 [− 0.168. 0.328]

0.525

Wake− up time regularity of > 1:00:00

Model 2A

− 0.011 [− 0.140, 0.119]

0.872

 

Model 2B

− 0.035 [− 0.164, 0.094]

0.597

Fat mass (kg)

Model 1

0.037 [− 0.021. 0.095]

0.210

Wake− up time regularity of ≤ 1:00:00

Model 2A

− 0.013 [− 0.069, 0.043]

0.649

 

Model 2B

− 0.023 [− 0.08, 0.033]

0.415

Fat mass (kg)

Model 1

0.048 [− 0.012. 0.107]

0.115

Wake− up time regularity of > 1:00:00

Model 2A

0.022 [− 0.008, 0.053]

0.153

 

Model 2B

0.009 [− 0.022, 0.039]

0.581

Visceral fat area (cm2)

Model 1

0.029 [− 0.03. 0.088]

0.335

Wake− up time regularity of ≤ 1:00:00

Model 2A

− 0.021 [− 0.077, 0.035]

0.466

 

Model 2B

− 0.035 [− 0.092, 0.022]

0.233

Visceral fat area (cm2)

Model 1

0.043 [− 0.021. 0.106]

0.188

Wake− up time regularity of > 1:00:00

Model 2A

0.025 [− 0.007, 0.057]

0.125

 

Model 2B

0.011 [− 0.022, 0.044]

0.507

  1. Model 1 was adjusted for gender, education, marital status, work schedule, smoking status, alcohol risk use, time in bed, chronotype and medication (blood pressure/diabetes/lipids/medication affecting the central nervous system)
  2. Model 2A: Model 1 further adjusted for sedentary time
  3. Model 2B: Model 1 further adjusted for total physical activity
  4. Significant results (p < 0.05) are indicated in bold