Skip to main content

Table 5 Predictors of Change in BMI during the School-Year and Summer

From: Later sleep timing predicts accelerated summer weight gain among elementary school children: a prospective observational study

Model Parameter

Estimate

SE

DF

t

pa

95% CI

LL

UL

Intercept

11.50

3.62

71.10

3.18

0.00

4.28

18.71

bChronotype: Definitely a Morning Type

0.82

1.45

70.80

0.57

0.57

−2.07

3.71

Chronotype: Rather a Morning Type than an Evening Type

1.48

1.44

70.80

1.03

0.31

−1.38

4.35

Chronotype: Neither a Morning nor an Evening Type

1.16

1.52

70.80

0.76

0.45

−1.87

4.19

Chronotype: Rather an Evening Type than a Morning Type

0.89

1.44

70.90

0.62

0.54

−1.98

3.76

Chronotype: Definitely an Evening Type

1.87

1.92

71.00

0.97

0.33

−1.96

5.70

cRace: African American

−0.95

1.04

71.50

−0.91

0.36

−3.02

1.12

Race: Caucasian

−0.48

0.94

71.70

−0.51

0.61

−2.34

1.39

Race: Asian

−1.53

1.06

71.60

−1.44

0.15

− 3.65

0.59

Race: Other

1.12

1.63

71.10

0.69

0.49

−2.13

4.37

Sex

−0.19

0.61

72.60

− 0.32

0.75

−1.41

1.03

Age-BLd

0.37

0.33

71.00

1.12

0.27

−0.29

1.02

Age-P1e

0.04

0.01

92.70

4.13

<.0001

0.02

0.07

Age-P2f

0.05

0.02

88.50

2.40

0.02

0.01

0.10

Sex x Age-P2

0.06

0.03

87.20

2.00

0.05

0.00

0.13

Total Sleep Time-School

0.00

0.01

71.30

0.03

0.97

−0.02

0.02

Total Sleep Time-Summer

0.01

0.01

71.10

1.40

0.17

0.00

0.03

Variability of Sleep Midpoint (RMSSDg)-Summer

0.00

0.01

71.00

−0.01

0.99

−0.02

0.02

Sleep Midpoint-Summer

0.01

0.00

72.70

1.62

0.11

0.00

0.01

Age-P2 x Sleep Midpoint-Summer

0.00

0.00

88.40

2.16

0.03

0.00

0.00

Sedentary Behavior-School

0.01

0.01

71.00

1.11

0.27

−0.01

0.02

Light PAh-School

0.01

0.01

71.10

1.08

0.28

−0.01

0.03

Moderate to Vigorous PA-School

0.02

0.01

71.60

1.31

0.20

−0.01

0.04

Sedentary Behavior-Summer

0.00

0.00

71.10

−0.19

0.85

−0.01

0.01

Light PA-Summer

0.00

0.00

70.90

0.15

0.88

−0.01

0.01

Moderate to Vigorous PA-Summer

−0.02

0.01

70.90

−1.53

0.13

−0.04

0.01

Percentage of Time Outdoors-School

−0.08

0.14

73.30

−0.58

0.56

−0.36

0.20

Percentage of Time Outdoors-Summer

0.07

0.11

71.20

0.65

0.52

−0.15

0.30

Age-P1 x Percentage of Time Outdoors-School

−0.01

0.01

91.90

−2.47

0.02

−0.02

0.00

  1. These are the results from a single growth curve model used to estimate individual differences in intercepts and slopes for BMI during the school-year and the summer. This model explained 27.72% of BMI variation across the study period (R2 = .27772)
  2. aSignificance level was set at p < .05. bReference category: I don’t know; cReference Category: Mixed Race; dBL: Baseline Fall 2016; eP1: End of the School-Year 2017; fP2: Beginning of the School-Year 2017; gRMSSD: Root Mean Square of Successive Differences; hPA: Physical Activity