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Table 1 General characteristics, oral health behavior, sleep duration, sleep quality depending on sleep types among Korean youths (n = 54,766) : N(%)

From: Association between sleep habits and symptoms of oral disease in adolescents: the 2017 Korea Youth Risk Behavior Web-based Survey

Variables Sleep types Total
A B
28,052 (51.2) 26,714 (48.8) 54,766 (100.0)
Gender
 Male 15,394 (54.9) 11,918 (44.6) 27,312 (49.9)
 Female 12,658 (45.1) 14,796 (55.4) 27,454 (50.1)
Mean age 14.4 15.7 15.0
School levels
 Middle 18,350 (65.4) 8152 (30.5) 26,502 (48.4)
 High 9702 (34.6) 18,562 (69.5) 28,264 (51.6)
Academic grades
 High 11,212 (40.0) 10,510 (39.3) 21,722 (39.7)
 Middle 8056 (28.7) 7722 (28.9) 15,778 (28.8)
 Low 8784 (31.3) 8482 (31.8) 17,266 (31.5)
Economic status
 High 11,346 (40.4) 10,366 (38.8) 21,712 (39.6)
 Middle 12,977 (46.3) 12,337 (46.2) 25,314 (46.2)
 Low 3729 (13.3) 4011 (15.0) 7740 (14.1)
Frequency of tooth brushinga
 1 274 (1.0) 264 (1.0) 538 (1.0)
 ≥ 2 27,778 (99.0) 26,450 (99.0) 54,228 (99.0)
Flossing habits
 Used 3776 (13.5) 3293 (12.3) 7069 (12.9)
 Not used 24,276 (86.5) 23,421 (87.7) 47,697 (87.1)
Sleep durationb
 < 6 1319 (4.7) 19,262 (72.1) 20,581 (37.6)
 6 ≤  < 7 6634 (23.6) 6782 (25.4) 13,416 (24.5)
 7 ≤  < 8 11,064 (39.4) 670 (2.5) 11,734 (21.4)
 ≥ 8 9035 (32.2) 0 (0.0) 9035 (16.5)
Sleep quality
 High 10,637 (37.9) 3147 (11.8) 13,784 (25.2)
 Middle 9985 (35.6) 7758 (29.0) 17,743 (32.4)
 Low 7430 (26.5) 15,809 (59.2) 23,239 (42.4)
  1. aTimes a day
  2. bHours