Table 1.

Prospective studies of sleep (reported by the parents) and obesity risk in boys and girls.

Reference	Number of subjects and years of follow-up	Results	Country of origin
Lumeng et al. [18], 2007	n = 785 aged 9–10 years (3rd grade) and 11–12 years (6th grade)	short sleep duration in 3rd grade is associated with overweight in 6th grade	USA
Agras et al. [19], 2004	n = 150 sleep reported at 3-5 years weight measured at 9.5 years	less sleep time in childhood is a risk factor for childhood overweight	USA
Reilly et al. [20], 2005	n = 7,758 sleep reported at 38 months obesity measured at 7 years	short sleep duration (<10.5 h) at age 3 years is associated with a risk of obesity	UK
Taveras et al. [21], 2008	n = 915 sleep reported at 6 months, 1 year and 2 years BMI z score measured at 3 years	short sleep duration (<12 h/day) during infancy is associated with a higher BMI z score at 3 years	USA
Touchette et al. [22], 2008	n = 1,138 sleep duration reported yearly from 2.5 to 6 years BMI measured at 2.5 and 6 years	persistent short sleepers (<10 h) increases risk of overweight and obesity in later childhood	Canada
Sugimori et al. [23], 2004	n = 8,170 sleep and BMI measured at ages 3 and 6 years	short sleep duration (≤9 h) is associated with a risk of obesity in boys, not in girls	Japan
Snell et al. [24], 2007	n = 2,281 aged 3–12 years at baseline and 5 years later	less sleep is associated with higher BMI, 5 years later	USA