1 = Male
2 = Female

1 = Sufficient and Exceed
2 = Sufficient
3 = Insufficient

1 = Smoker
2 = Non-smoker

In the last month, how often have you been upset because of something that happened unexpectedly?
0 = never
1 = almost never
2 = sometimes
3 = fairly often
4 = very often

is COVID-19 pandemic cause mental distress to you?
0 = never
1 = sometimes
2 = very often

PSS level
1 = Low perceived stress.
2 = Moderate perceived stress.
3 = High perceived stress.

1 = Before COVID-19 pandemic
2 = During COVID-19 pandemic

1 = 1-6
2 = 7-12

1 = <=2.5
2 = >2.5

1 = Less than 22
2 = 23 and older

1 = Low to moderate stree
2 = High stress

1 = Sufficient
2 = Insufficient