Table 2.

Associations of chronotype score (MEQ^a) with social jet lag, sleep duration, meal timing, physical activity and body mass index (BMI)^b

Characteristics	βc	95% CId	P valuee
Body mass index(kg/m2)	-0.056	-0.085, -0.028	< 0.0001
Meal timing
Breakfast time weekdays (h:min)	-0.004	-0.007, -0.002	0.001
Breakfast time weekends (h:min)	-0.026	-0.032, -0.021	< 0.0001
Lunch time weekdays (h:min)	-0.007	-0.010, -0.004	< 0.0001
Lunch time weekends (h:min)	-0.013	-0.017, -0.009	< 0.0001
Dinner time weekdays (h:min)	-0.009	-0.013, -0.004	< 0.0001
Dinner time weekends (h:min)	-0.009	-0.014, -0.004	< 0.0001
Weekdays Eating midpoint (h:min)	-0.016	-0.021, -0.011	< 0.0001
Weekends Eating midpoint (h:min)	-0.027	-0.033, -0.021	< 0.0001
Eating jet lag (h)	-0.012	-0.016, -0.008	< 0.0001
Physical activity
Light physical activity 60 min a day (days/week)	0.041	0.022, 0.060	< 0.0001
Moderate physical activity 60 min a day (days/week)	0.040	0.023, 0.057	< 0.0001
Muscle strengthening activity 60 min a day (days/week)	0.049	0.029, 0.068	< 0.0001
Average sleep duration (h/night)	0.014	0.009, 0.018	< 0.0001
Sleep duration in weekdays (h/night)	0.013	0.008, 0.017	< 0.0001
Sleep duration in weekends (h/night)	0.017	0.012, 0.023	< 0.0001
Social jet lag (h)	-0.007	-0.010, -0.004	< 0.0001

^a MEQ, Morning-Evening Questionnaire

Data are presented as unstandardized beta coefficients (standard error)

Chronotype score was expressed as a continuous variable ranging from 16 to 86, higher score indicates a preference for morningness. CI, confidence interval

^b Models adjust for children age, sex, parental marital status and parental education level on college

^c β: standardized regression

^d c: confidence interval

^eP value from the multiple linear regression model

Bold: P values<0.05