Skip to main content
. 2017 Oct 23;19(10):e363. doi: 10.2196/jmir.7930

Table 2.

Associations between cofactors and low total and deep sleep durations and deep/total ratio (N=15,839).

Factors RIsk of low total sleep duration
(≤6 hours)		 Risk of low deep sleep duration
(≤3 hours)		 Risk of low deep/total ratio
(≤0.40)


ORa 95% CIb P value OR 95% CI P value OR 95% CI P value
Age, years

.024

<.001

<.001

18-30 1 Ref
1 Ref
1 Ref

31-40 1.59 1.10-2.27
0.99 0.74-1.34
0.63 0.46-0.86

41-50 1.46 1.03-2.07
0.83 0.63-1.11
0.54 0.40-0.73

51-60 1.50 1.06-2.13
0.79 0.60-1.05
0.50 0.37-0.68

>60 1.33 0.94-1.89
0.71 0.53-0.94
0.47 0.35-0.63
Sex









Male 1 Ref
1 Ref
1 Ref

Female 0.70 0.61-0.81
0.51 0.45-0.58
0.45 0.38-0.54
Weight (kg)

.002

.162

.992

≤75 1 Ref
1 Ref
1 Ref

76-86 0.94 0.84-1.07
0.96 0.86-1.07
0.96 0.84-1.09

87-98 0.98 0.86-1.11
0.97 0.87-1.09
0.92 0.80-1.05

>98 1.17 1.03-1.33
1.05 0.94-1.18
0.97 0.85-1.12
Heart rate (bpm)
.003

.005

.016

≤61 1 Ref
1 Ref
1 Ref

62-68 1.00 0.89-1.12
1.02 0.91-1.13
1.01 0.89-1.15

69-78 1.17 1.05-1.32
1.10 0.99-1.22
1.05 0.93-1.19

>78 1.14 1.01-1.29
1.14 1.02-1.27
1.18 1.04-1.34
Steps (n/day)

.170

.081

,441

≤4890 1 Ref
1 Ref
1 Ref

4891-6737 0.95 0.84-1.07
1.00 0.89-1.12
1.00 0.88-1.14

6738-9028 1.05 0.93-1.18
1.09 0.98-1.22
0.97 0.85-1.10

>9028 1.07 0.94-1.20
1.13 1.01-1.27
0.99 0.87-1.13
Diastolic blood pressure (mm Hg)
.083

<.001

.005

≤70 1 Ref
1 Ref
1 Ref

71-77 1.03 0.91-1.17
0.95 0.85-1.06
0.91 0.79-1.04

78-83 1.05 0.92-1.20
1.06 0.93-1.19
1.01 0.87-1.17

>83 1.10 0.95-1.28
1.21 1.06-1.39
1.12 0.95-1.32
Systolic blood pressure (mm Hg)
.305

.222

<.001

≤116 1 Ref
1 Ref
1 Ref

117-124 0.93 0.82-1.05
0.98 0.87-1.09
1.08 0.94-1.24

125-133 0.98 0.86-1.12
0.96 0.85-1.08
1.15 0.99-1.33

>133 0.99 0.85-1.14
1.00 0.88-1.15
1.22 1.04-1.43

aOR: odds ratio.

bCI: confidence interval.