Skip to main content

Table 1 Demographic characteristics of the study subjects

From: An association study in the Taiwan Biobank elicits the GABAA receptor genes GABRB3, GABRA5, and GABRG3 as candidate loci for sleep duration in the Taiwanese population

Characteristic Overall Male Female
No. of subjects, n 10,127 2,327 7,800
Mean age ± SD, years 56.5 ± 9.4 58.0 ± 9.8 56.1 ± 9.2
Sleep duration ± SD, hours per day 6.6 ± 1.1 6.7 ± 1.1 6.4 ± 1.2
Sleep quality, n (%)    
 “1” for very poor 1: 271 (2.7) 1: 37 (1.6) 1: 234 (3.0)
 “2” for poor 2: 1,927 (19.0) 2: 355 (15.3) 2: 1,572 (20.2)
 “3” for fair 3: 4,374 (43.2) 3: 950 (40.8) 3: 3,424 (43.9)
 “4” for good 4: 2,140 (21.1) 4: 571 (24.5) 4: 1,569 (20.1)
 “5” for very good 5: 1,412 (13.8) 5: 414 (17.8) 5: 998 (12.8)
Sleep timing, n (%)    
 (1) 0–4 AM (1): 2,071 (20.5) (1): 440 (18.9) (1): 1,631 (20.9)
 (2) 4–8 AM (2): 23 (0.2) (2): 11 (0.5) (2): 12 (0.2)
 (3) 8–12 AM (3): 20 (0.2) (3): 11 (0.5) (3): 9 (0.1)
 (4) 12–16 PM (4): 7 (0.1) (4): 0 (0.0) (4): 7 (0.1)
 (5) 16–20 PM (5): 27 (0.3) (5): 9 (0.4) (5): 18 (0.2)
 (6) 20–24 PM (6): 7,941 (78.4) (6): 1,830 (78.6) (6): 6,111 (78.3)
  1. Data are presented as mean ± standard deviation
  2. Sleep quality is classified as “1” for very poor, “2” for poor, “3” for fair, “4” for good, and “5” for very good to evaluate the quality of usual sleep
  3. Sleep timing is divided into six subgroups: (1) 0–4 AM, (2) 4–8 AM, (3) 8–12 AM, (4) 12–16 PM, (5) 16–20 PM, and (6) 20–24 PM based on usual sleep onset time
  4. SD standard deviation