3.1 | Demographic characteristics of participants
During the 7 years, a total of 457,685 among 475,575 targeted adolescents completed the survey with a total response rate of 96.2% (range 95.3-97.2%). Among them, 60,615 participants did not provide available sleep records. Therefore, their data was considered to be missing and were excluded. This left a total of 34,067 adolescent with asthma and 363,003 adolescents without asthma. The overall prevalence rate of asthma during the entire survey was 8.7% (Table 1). Table 2 shows the general characteristics of the participants and the differences between subjects with asthma and without. Especially, adolescents with asthma self-reported unhealthier and unhappier perceptions, had more stress, higher levels of depression, and more frequent suicidal ideation and suicidal attempts than did those without asthma.