TABLE 1

Characteristics of 1046 Children From Project Viva, Overall, and by Sleep Curtailment Score

CharacteristicsSleep Curtailment Score: 0 = Maximum Curtailed Sleep to 13 = Never Curtailed Sleep
Overall0 to 45 to 78 to 910 to 1112 to 13
N = 104646 (4.4%)129 (12.3%)148 (14.1%)302 (28.8%)421 (40.3%)
Maternal and householdMean (SD) or %
 Maternal age (y)32.3 (0.16)30.5 (6.8)31.3 (7.1)32.3 (6.9)32.8 (5.5)32.5 (4.5)
 Maternal BMI (kg/m2)24.6 (0.16)27.5 (8.0)24.9 (6.3)25.4 (6.1)24.6 (5.5)23.9 (4.7)
 Parity, nulliparous, %47.928.041.950.745.053.0
 Education, ≥college graduate, %70.833.849.063.075.980.7
 Household income >$70 000, %63.425.643.852.966.874.9
Child
 Girl, %50.354.840.248.349.454.2
 Race/ethnicity, %
 White66.321.036.953.770.381.8
 Black14.838.933.826.412.44.2
 Hispanic3.47.58.83.42.02.2
 Other15.532.620.516.515.411.8
 Television viewing at age 7 y (h/d)1.5 (1.0)2.4 (1.4)2 (1.3)1.7 (1.2)1.5 (1.0)1.3 (0.8)
Age 7 years anthropometric outcomes
 BMI z score (units)0.37 (0.03)1.01 (1.18)0.58 (1.21)0.48 (1.12)0.35 (1.08)0.21 (0.96)
 Sum of subscapular and triceps skinfolds (mm)19.5 (0.29)26.3 (15.6)21.3 (12.6)20.6 (11.7)19.4 (9.9)18 (7.7)
 DXA FMI (kg/m2)4.4 (0.06)5.6 (3.0)4.6 (2.5)4.5 (2.2)4.4 (2.0)4.1 (1.6)
 DXA trunk FMI (kg/m2)1.5 (0.03)2 (1.4)1.6 (1.1)1.5 (1.0)1.5 (0.9)1.3 (0.7)
 Waist circumference (cm)59.7 (0.25)64.8 (12.3)61.5 (11.1)60.7 (9.9)59.7 (8.4)58.2 (6.7)
 Hip circumference (cm)68.0 (0.23)72.9 (10.8)69.9 (10.0)68.8 (8.8)68.1 (8.2)66.5 (6.7)
BMI category
 <85th percentile75.055.366.470.074.981.7
 85th to 95th percentile13.810.715.315.716.011.5
 ≥95th percentile11.134.018.314.29.16.8
  • DXA, dual-energy radiograph absorptiometry.