Table 3 Results of the linear mixed effects regression models of the association between change (Δ) in MSFsc or SJL and Δ in BMI-SDS and Δ Body composition measures in N = 572 (n = 213) participants, stratified by age groups (years), DONALD Study, 2015–2019.

From: Changes in chronotype and social jetlag during adolescence and their association with concurrent changes in BMI-SDS and body composition, in the DONALD Study

 

Δ MSFsca

Δ SJLb

Outcome of interestc

N

nd

beta

95% CI

p value

beta

95% CI

p value

Δ BMI-SDS change

        

 Age <12

145

88

0.08

(−0.05,0.21)

0.24

0.03

(−0.10,0.17)

0.64

 Age ≥12 ≤ 15

196

67

0.14

(0.02,0.26)

0.03

0.17

(0.07,0.30)

0.003

 Age >15

231

58

0.06

(−0.06,0.17)

0.32

0.05

(−0.04,0.15)

0.27

Δ FFMI change

 Age <12

145

88

−0.02

(−0.29,0.24)

0.82

0.14

(−0.17,0.45)

0.31

 Age ≥12 ≤ 15

196

67

0.08

(−0.08,0.25)

0.31

0.16

(−0.01,0.34)

0.06

 Age >15

231

58

0.04

(−0.16,0.24)

0.70

0.02

(−0.19,0.24)

0.84

Δ Log transformed FMI change

 Age <12

145

88

0.02

(−0.05,0.10)

0.46

−0.02

(−0.11,0.08)

0.67

 Age ≥12 ≤ 15

196

67

0.11

(0.05,0.16)

<0.001

0.12

(0.57,0.19)

0.001

 Age > 15

231

58

0.02

(−0.03,0.08)

0.39

0.02

(−0.04,0.08)

0.42

  1. MSFsc Midpoint of sleep, SJL Social Jetlag, CI Confidence Interval, BMI-SDS Body Mass Index-Standard Deviation Score (kg/m2), FFMI Fat Free Mass Index (kg/m2), FMI Fat Mass Index (kg/m2).
  2. aBMI-SDS models contain a random intercept and slope for chronotype change with a variance components structure (VC). FFMI models contain a random intercept and slope for chronotype change and time with a VC structure. Log FMI models contain a random intercept and slope for time with an unstructured covariance structure (UN).
  3. bBMI-SDS models contain a random intercept and slope for time with an un structure. FFMI models contain a random intercept and slope for time with a VC structure. Log FMI models contain a random intercept and slope for time with a VC structure.
  4. cAll models were adjusted for age at baseline, sex, time between last and first measurement, age at take-off, persons in the household, maternal BMI (kg/m2).
  5. dN: total number of questionnaires, n: number of participants.
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