Table 3.
Differences according to electronic cigarette experience among Korean participants without asthma and with asthma, 2015–2017
| Characteristics |
Adolescents without asthma (N=178444) |
Adolescents with asthma (N=17403) |
||||
|---|---|---|---|---|---|---|
|
Experience of EC use |
Experience of EC use |
|||||
| No (n=163851) | Yes (n=14593) | p | No (n=15635) | Yes (n=1768) | p | |
| Sex | <0.001 | <0.001 | ||||
| Female | 85208 (51.40) | 2704 (17.94) | 6961 (43.70) | 343 (18.62) | ||
| Male | 78643 (48.60) | 11889 (82.06) | 8674 (56.30) | 1425 (81.38) | ||
| Grade | <0.001 | <0.001 | ||||
| Middle school | 84734 (47.83) | 3757 (23.38) | 8391 (50.10) | 521 (27.49) | ||
| High school | 79117 (52.17) | 10836 (76.62) | 7244 (49.90) | 1247 (72.51) | ||
| Subjective economic state | <0.001 | <0.001 | ||||
| High | 61699 (37.99) | 5119 (35.55) | 6097 (39.39) | 661 (37.18) | ||
| Middle | 77744 (47.25) | 6221 (42.41) | 6993 (44.47) | 642 (36.26) | ||
| Low | 24408 (14.76) | 3253 (22.04) | 2545 (16.15) | 465 (26.56) | ||
| Academic achievement | <0.001 | <0.001 | ||||
| High | 64509 (39.18) | 3919 (26.57) | 6513 (41.33) | 512 (29.27) | ||
| Middle | 47098 (28.89) | 3565 (24.47) | 4343 (27.99) | 382 (21.79) | ||
| Low | 52244 (31.93) | 7109 (48.95) | 4779 (30.68) | 874 (48.95) | ||
| Current drinking | <0.001 | <0.001 | ||||
| No | 144735 (87.91) | 6565 (44.60) | 13748 (87.45) | 752 (42.39) | ||
| Yes | 19116 (12.09) | 8028 (55.40) | 1887 (12.55) | 1016 (57.61) | ||
| Current smoking | <0.001 | <0.001 | ||||
| No | 160090 (97.66) | 6877 (46.68) | 15197 (97.20) | 779 (43.81) | ||
| Yes | 3761 (2.34) | 7716 (53.32) | 438 (2.80) | 989 (56.19) | ||
| Subjective healthiness | <0.001 | 0.025 | ||||
| Healthy | 119873 (72.85) | 10683 (73.43) | 10012 (63.87) | 1135 (64.97) | ||
| Average | 34797 (21.43) | 2926 (19.80) | 4084 (26.32) | 431 (23.56) | ||
| Unhealthy | 9181 (5.72) | 984 (6.78) | 1539 (9.81) | 202 (11.47) | ||
| Subjective happiness | <0.001 | <0.001 | ||||
| Happy | 110963 (67.23) | 8679 (59.25) | 10223 (64.67) | 977 (55.10) | ||
| Average | 41196 (25.52) | 4295 (29.31) | 3955 (25.87) | 528 (29.67) | ||
| Unhappy | 11692 (7.25) | 1619 (11.44) | 1457 (9.46) | 263 (15.23) | ||
| Perceived stress | <0.001 | <0.001 | ||||
| Often | 58532 (35.80) | 5907 (40.42) | 6305 (40.36) | 819 (45.80) | ||
| Sometimes | 71097 (43.68) | 5908 (40.52) | 6504 (41.78) | 632 (35.55) | ||
| Never | 34222 (20.53) | 2778 (19.07) | 2826 (17.86) | 317 (18.65) | ||
| Sleep satisfaction | <0.001 | <0.001 | ||||
| Plenty | 45563 (27.00) | 3006 (20.27) | 4261 (26.50) | 338 (19.13) | ||
| A little | 53628 (32.78) | 4499 (30.52) | 4883 (31.38) | 538 (30.76) | ||
| Not enough | 64660 (40.22) | 7088 (49.22) | 6491 (42.12) | 892 (50.12) | ||
| Depression | <0.001 | <0.001 | ||||
| No | 125910 (76.76) | 9559 (65.26) | 11302 (72.09) | 1035 (58.21) | ||
| Yes | 37941 (23.24) | 5034 (34.74) | 4333 (27.91) | 733 (41.79) | ||
| Suicidal ideation | <0.001 | <0.001 | ||||
| No | 145700 (88.87) | 12116 (83.16) | 13375 (85.48) | 1365 (77.65) | ||
| Yes | 18151 (11.13) | 2477 (16.84) | 2260 (14.52) | 403 (22.35) | ||
| Suicidal attempt | <0.001 | <0.001 | ||||
| No | 160463 (97.96) | 13810 (94.60) | 15167 (96.96) | 1581 (89.34) | ||
| Yes | 3388 (2.04) | 783 (5.40) | 468 (3.04) | 187 (10.66) | ||
Numbers represent frequency and column percentages for each characteristic. Current smokers were defined as those who responded ‘more than one day’ to the following question: ‘How many days did you smoke even one cigarette during past 30 days before this survey?’ by the standpoint of the Korea Youth Risk Behavior Web-based Surveys. To measure EC smoking participants were asked a binary (yes or no) question regardless of smoking status or experience: ‘Have you ever used ECs in your lifetime?’. For those who answered yes, a follow-up question was asked: ‘In the last 30 days have you used ECs?’. Other definition or concept of variables are mentioned in the Methods section of the manuscript. Survey data were weighted for statistical representation of the general population based on the sample design. Survey data were weighed for statistical representation of the general population based on the sample design. Chi-squared test was applied to determine statistical differences between categorical data and independent t-test was used for continuous variables.