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 ()	value^a

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)
kcal	2064.8 (961.0)	1917.5 (903.2)	2219.2 (1055.0)	1965.4 (883.3)	2187.0 (1054.3)	NS
% kcal from fat	41.4 (8.2)	39.8 (7.0)	40.2 (7.1)	41.1 (8.37)	41.3 (7.9)	NS
% kcal from protein	15.0 (2.8)	15.6 (3.3)	15.7 (3.0)	15.5 (3.5)	15.4 (3.0)	NS
% kcal from carbohydrates	45.4 (8.1)	45.8 (7.5)	44.9 (7.4)	43.9 (9.3)	43.8 (8.9)	NS
% kcal from sweets	14.4 (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.