Table 3.

Relationships between Sleep Duration Category and BMI, stratified by Age Group.

Model	Sleep Category	16–17	18–29	30–49	50–64	≥65
		β (95% CI)	β (95% CI)	β (95% CI)	β (95% CI)	β (95% CI)
Unadjusted	≤4 Hours	5.22 (−2.82, 13.27)	***4.32 (1.86, 6.78)	1.23 (−0.00, 2.46)	1.98 (−0.58, 4.54)	1.24 (−0.54, 3.01)
	5–6 Hours	1.48 (−0.61, 3.58)	*1.58 (0.35, 2.80)	**1.24 (0.42, 2.06)	0.46 (−0.54, 1.46)	0.76 (−0.23, 1.75)
	7–8 Hours	Reference	Reference	Reference	Reference	Reference
	9+ Hours	0.30 (−2.18, 2.77)	*−1.43 (−2.78, −0.07)	0.31 (−1.64, 2.26)	0.13 (−1.79, 2.05)	−0.32 (−1.27, 0.63)
Adjusteda	≤4 Hours	5.08 (−1.91, 12.07)	**3.49 (0.89, 6.09)	0.77 (−0.48, 2.02)	1.71 (−1.05, 4.46)	1.38 (−0.34, 3.11)
	5–6 Hours	0.97 (−0.93, 2.87)	**2.13 (0.77, 3.48)	**1.16 (0.32, 2.00)	0.51 (−0.47, 1.49)	0.78 (−0.21, 1.77)
	7–8 Hours	Reference	Reference	Reference	Reference	Reference
	9+ Hours	−0.14 (−2.61, 2.34)	−1.61 (−3.38, 0.15)	−0.02 (−1.95, 1.91)	0.16 (−1.71, 2.02)	−0.35 (−1.34, 0.63)
Fully-Adjustedb	≤4 Hours	4.91 (−2.03, 11.85)	2.35 (−0.32, 5.01)	0.44 (−0.92, 1.81)	2.12 (−0.71, 4.94)	1.30 (−0.48, 3.07)
	5–6 Hours	1.49 (−0.48, 3.47)	*1.87 (0.44, 3.30)	**1.22 (0.32, 2.11)	0.57 (−0.44, 1.59)	0.50 (−0.54, 1.54)
	7–8 Hours	Reference	Reference	Reference	Reference	Reference
	9+ Hours	0.46 (−1.93, 2.86)	−1.84 (−3.72, 0.04)	0.01 (−2.06, 2.07)	0.33 (−1.54, 2.20)	−0.17 (−1.22, 0.89)

β values reflect difference in BMI for each sleep duration group, relative to 7–8 hours.

^*P<0.05,

^**P<0.01,

^***P<0.001

^aAdjusted analyses include sex, race/ethnicity, marital status, exercise, income to poverty ratio, and education

^bAdjusted for sex, race/ethnicity, marital status, exercise, income to poverty ratio, education, total caloric intake, alcohol, smoking, number of foods in diet, and depression.