1 = Male
2 = Female

1 = 20 years old or below
2 = 21-30 years old
3 = 31-40 years old
4 = 41 years old or above

Education level
1 = Junior college or below
2 = Bachelor's degree
3 = Postgraduate degree or above

Frequency of using STEM online courses for learning
1 = Occasional use
2 = Regular use
3 = Frequent use

Weekly online learning duration
1 = Less than 5 hours
2 = 5-10 hours
3 = 10-20 hours
4 = More than 20 hours