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. 2021 Jan 18;12:615838. doi: 10.3389/fnagi.2020.615838

Table 1.

Characteristics of the total study population.

Characteristics Total (n = 1,459) Good sleep (n = 579) General sleep (n = 649) Poor sleep (n = 231) P-value
Age, years 57.4 (9.7) 55.6 (9.0) 58.0 (10.0) 60.3 (9.6) <0.001
Male, n (%) 598 (41%) 271 (46.8%) 264 (40.6%) 63 (27.3%) <0.001
Education, years 7.0 (4.9) 8.0 (6.9) 7.0 (4.9) 6.0 (2.8) <0.001
Hypertendion, n (%) 375 (24.7%) 111 (19.2%) 184 (28.4%) 80 (34.6%) <0.001
Diabetes mellitus, n (%) 171 (11.7%) 59 (10.2%) 83 (12.8%) 29 (12.6%) 0.247
Cardiovascular disease, n (%) 77 (5.3%) 16 (2.8%) 38 (5.9%) 23 (10%) 0.001
Cerebrovascular disease, n (%) 106 (7.3%) 31 (5.4%) 53 (8.2%) 22 (9.5%) 0.139
Smoking, n (%) 461 (31.6%) 207 (35.8%) 206 (31.7%) 48 (20.8%) 0.001
Drinking, n (%) 176 (12.1%) 77 (13.3%) 75 (11.6%) 24 (10.4%) 0.394
Lack of physical activity, n (%) 337 (19.8%) 11 (16.7%) 153 (20.5%) 74 (25.3%) 0.008
BMI (kg/m2) 25.3 (3.5) 25.3 (3.1) 25.2 (3.8) 25.3 (3.3) 0.402
Pulse rate 74.1 (10.4) 73.9 (10.1) 74.0 (10.9) 74.9 (9.7) 0.391
Mean artery pressure, mmHg 96.1 (12.0) 95.5 (11.7) 96.4 (11.8) 96.5 (13.2) 0.298
Fasting blood glucose, mmol/l 5.7 (1.5) 5.7 (1.8) 5.7 (1.4) 5.7 (1.3) 0.807
Total cholesteral, mmol/l 5.16 (1.06) 5.13 (0.99) 5.21 (1.10) 5.11 (1.13) 0.279
TG, mmol/l 1.60 (1.11) 1.61 (0.92) 1.56 (1.25) 1.68 (1.17) 0.369
Low-density lipoprotein, mmol/l 2.62 (0.74) 2.64 (0.81) 2.64 (0.68) 2.53 (0.66) 0.152
High-density lipoprotein, mmol/l 1.60 (0.38) 1.58 (0.36) 1.63 (0.42) 1.60 (0.34) 0.073
APOE ε4 carriers, n (%) 184(12.6%) 68 (11.8%) 80 (12.3%) 36 (29.2%) 0.322

One-way ANOVA or the Kruskal–Wallis test was used to compare the difference between the approximately normally distributed continuous variables among different sleep groups. The Kruskal–Wallis test and the median (quartile) were used for the skew distributional data and the Chi-square test, and the percentage was used for categorical variables. Data are mean (SD), median (interquartile range), or number (percentage). SD, standard deviation; BMI, body mass index; TG, triglyceride.