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