TABLE 2

ORs (95% CIs) for the Association Between Demographic Variables and Probability of Regular ≥7 Hours of Sleep Per Night and Regularly Getting Adequate Sleep, By Time Period

1991–19951996–20002001–20052006–20102011–2012Interactions
Get 7 h of sleep
n =n = 78 444n = 57 735n = 55 484n = 56 646 n = 22 590
GenderFemale0.68 (0.66–0.7)0.68 (0.66–0.71)0.7 (0.67–0.72)0.67 (0.64–0.69)0.66 (0.63–0.7)0.84
Male11111
RaceBlack0.99 (0.95–1.04)0.97 (0.92–1.02)1.07 (1.01–1.12)0.84 (0.79–0.88)0.89 (0.81–0.97)0.05
Hispanic0.9 (0.85–0.94)0.99 (0.93–1.04)0.95 (0.9–1)0.87 (0.83–0.91)0.92 (0.85–0.99)0.90
Asian0.86 (0.79–0.93)0.83 (0.76–0.9)0.79 (0.73–0.87)0.75 (0.69–0.81)0.99 (0.87–1.12)0.33
Other1.03 (0.98–1.09)1.06 (0.99–1.13)1.05 (0.98–1.12)0.83 (0.78–0.88)0.94 (0.86–1.02)0.99
White11111
UrbanicityNonurban1.12 (1.09–1.16)1.11 (1.07–1.16)1.06 (1.01–1.1)1.11 (1.06–1.15)1.15 (1.08–1.22)0.93
Urban11111
Highest parental education>High school1.33 (1.26–1.41)1.25 (1.17–1.34)1.22 (1.14–1.32)1.34 (1.25–1.44)1.34 (1.2–1.5)0.10
High school1.22 (1.15–1.3)1.2 (1.11–1.29)1.07 (0.99–1.16)1.15 (1.07–1.25)1.15 (1.01–1.31)0.02
<High school11111
Age, y18–190.29 (0.27–0.31)0.27 (0.25–0.29)0.25 (0.23–0.27)0.29 (0.27–0.32)0.32 (0.28–0.35)<0.01
16–170.46 (0.44–0.48)0.42 (0.4–0.44)0.39 (0.38–0.42)0.45 (0.42–0.47)0.43 (0.39–0.46)0.09
14–150.7 (0.67–0.73)0.7 (0.66–0.73)0.67 (0.64–0.71)0.69 (0.66–0.73)0.65 (0.6–0.7)0.01
12–1311111
Get adequate sleep
n = 78 374n = 57 688n = 55 450n = 56 617n = 22 590
GenderFemale0.81 (0.78–0.83)0.81 (0.79–0.84)0.87 (0.83–0.9)0.82 (0.79–0.85)0.82 (0.77–0.87)0.18
Male11111
RaceBlack1.58 (1.51–1.65)1.55 (1.47–1.64)1.52 (1.44–1.61)1.39 (1.31–1.48)1.15 (1.05–1.26)0.03
Hispanic1.38 (1.31–1.46)1.48 (1.39–1.56)1.39 (1.31–1.47)1.3 (1.23–1.37)1.1 (1.01–1.2)<0.01
Asian0.89 (0.81–0.98)0.9 (0.82–1)0.81 (0.73–0.9)0.85 (0.77–0.93)0.92 (0.8–1.06)0.03
Other1.27 (1.2–1.35)1.37 (1.28–1.47)1.33 (1.24–1.43)1.08 (1.01–1.15)0.98 (0.89–1.07)0.29
White11111
UrbanicityNonurban1.19 (1.15–1.23)1.18 (1.13–1.23)1.15 (1.09–1.2)1.14 (1.09–1.19)1.12 (1.05–1.2)0.94
Urban11111
Highest parental education>High school0.75 (0.7–0.8)0.65 (0.6–0.7)0.69 (0.64–0.74)0.76 (0.71–0.82)0.92 (0.81–1.04)<0.01
High school0.88 (0.83–0.94)0.85 (0.79–0.92)0.85 (0.78–0.93)0.86 (0.79–0.94)1.05 (0.91–1.21)0.99
<High school11111
Age, y18–190.43 (0.4–0.46)0.41 (0.38–0.44)0.44 (0.41–0.48)0.41 (0.38–0.45)0.44 (0.39–0.49)0.38
16–170.51 (0.49–0.53)0.5 (0.48–0.53)0.54 (0.51–0.57)0.52 (0.49–0.55)0.46 (0.42–0.5)0.36
14–150.74 (0.72–0.77)0.76 (0.72–0.8)0.79 (0.75–0.83)0.77 (0.73–0.81)0.68 (0.63–0.74)0.07
12–13111110.18
  • The interaction with each variable was tested by year, with year modeled as a continuous variable to determine whether the magnitude of the odds ratios (ORs) were increasing or decreasing over time. CI, confidence interval.