Sleep duration and its relationship with overweight and obesity among students in Ningxia

Objective To explore sleep duration and its relationship with overweight and obesity among students in Ningxia.Methods Data came from 2014 National Survey on Students Physical Fitness and Health in Ningxia area.A total of 9 853 children and adolescents were investigated with sleep duration,as well as height and weight assessment.Results Proportions of sleep duration <6 h/d,6-6.9 h/d,7-7.9 h/d and ≥8 h/d was 13.9%,35.6%,22.3% and 28.2%,respectively.Insufficient sleep (< 8 h) was reported by 71.8% of all participants.Self-rated sufficient sleep duration (≥8 h/d) rates decreased with age.The overweight and obesity rates was 7.4% and 2%,respectively,which decreased with sleep time increased.Univariate logistic regression analysis revealed that,compared with sufficient sleep duration,sleep durations <6 h/d and 6-6.9 h/d were associated with overweight and obesity.The adjusted odds ratios (OR) were 1.667(1.224-2.270) and 1.363(1.046-1.777),respectively(x2 =82.020,29.301,P<0.01).Conclusion Insufficient sleep may be a risk factor for overweight among students in Ningxia.It is important to ensure adequate sleep duration of children and foster healthy lifestyle at an early stage of life.