International Scholarly Research Notices / 2012 / Article / Tab 1

Research Article

Time in Bed Is Associated with Decreased Physical Activity and Higher BMI in Women Seeking Weight Loss Treatment

Table 1

Unadjusted mean (standard deviations) for BMI, physical activity, and dietary variables by sleep categories ( ).

Sleep duration categories
≤6 hrs
( )
>6 to ≤7 hrs
( )
>7 to ≤8 hrs
( )
>8 to ≤9 hrs
( )
>9 hrs
( )
valuea

Body mass index, mean (SD)38.8 (5.5)36.0 (5.0)36.1 (5.8)35.8 (5.6)36.3 (5.8)0.04
Paffenbarger physical activity (kcal burned), mean (SD)556.0 (889.7)752.9 (1148.4)934.6 (1215.3)713.7 (746.4)788.3 (981.4)0.07
block FFQ, mean (SD)
 kcal2064.8 (961.0)1917.5 (903.2)2219.2 (1055.0)1965.4 (883.3)2187.0 (1054.3)NS
 % kcal from fat41.4 (8.2)39.8 (7.0)40.2 (7.1)41.1 (8.37)41.3 (7.9)NS
 % kcal from protein15.0 (2.8)15.6 (3.3)15.7 (3.0)15.5 (3.5)15.4 (3.0)NS
 % kcal from carbohydrates45.4 (8.1)45.8 (7.5)44.9 (7.4)43.9 (9.3)43.8 (8.9)NS
 % kcal from sweets14.4 (7.8)12.9 (9.0)12.8 (8.9)12.0 (8.8)13.6 (12.9)NS

Statistical significance was determined using a quadratic orthogonal contrast, motivated by a priori hypothesis of a U-shaped response.