Table 1.

Attrition analysis

	Sample size (N)
Total	19,712
Individuals aged <20 years	9,775
Individuals aged ≥ 40 years	6,258
Individuals aged 20–39 years	3,679
Pregnant women	378
Among young adults aged 20–39 years without pregnant women	3,301
no quality of life data	330
no sleep data	371
no sociodemographic data (education)	2
no lifestyle data	596
no depression data	342
no body mass index data	33
Final study sample size	2,391

Note: Some participants had no data on health-related quality of life, sleep, sociodemographic characteristics, lifestyle, depression, or body mass index. Therefore, the sum of the number of all the missing data was not equal to the number 910 (3,301–2,391).