Table 2.

Log-odds from multinomial regression models predicting sleep duration, sample adults aged 18–84, National Health Interview Survey, 2004–2017

	≤6 vs. 7–8 hr				≥9 vs. 7–8 hr
	b	P	95% Confidence interval		b	P	95% Confidence interval
Year
2004 (Ref)
2005	0.00		−0.04	0.05	0.01		−0.06	0.09
2006	0.00		−0.05	0.05	−0.01		−0.10	0.08
2007	−0.08		−0.14	−0.03	−0.08		−0.17	0.00
2008	−0.03		−0.08	0.03	0.00		−0.08	0.08
2009	−0.02		−0.07	0.03	0.02		−0.06	0.10
2010	0.01		−0.03	0.06	0.08		0.00	0.16
2011	0.01		−0.03	0.06	−0.02		−0.09	0.06
2012	0.05		0.00	0.10	−0.01		−0.09	0.07
2013	0.09	***	0.05	0.14	0.00		−0.08	0.07
2014	0.11	***	0.07	0.16	−0.03		−0.12	0.06
2015	0.16	***	0.12	0.21	0.01		−0.07	0.09
2016	0.17	***	0.12	0.21	−0.12	***	−0.21	−0.04
2017	0.18	***	0.13	0.23	−0.08		−0.16	0.01
Constant	−1.83	***	1.93	−1.73	−1.19	***	−1.36	−1.02
N = 398 382

*p < 0.05; **p < 0.01; ***p < 0.001.

Source: National Health Interview Survey, 2004–2017.

Model includes controls for respondent: Age, Age² Gender, Race/Ethnicity, Marital Status, Number of Children, Region of Residence, Smoking Status, Alcohol Consumption, Body Mass Index, Self-Reported Health, Kessler-6 Scale, Educational Attainment, Household Income, and Hours Worked Per Week. Full results are presented in Supplementary Table S2. Data are weighted to be representative of the U.S. Population.