Gender of the participants
1 = Male
2 = Female

College type
1 = Medical
2 = Dentistry

Year of education
1 = First year
2 = Second year
3 = Third year
4 = Fourth year
5 = Fifth year

Smoking status
1 = Daily
2 = Rarely
3 = Never

Marital status of the participants
1 = Single
2 = Married

Father education
1 = No forma education
2 = Formal education upto school level
3 = University undergraduat
4 = University postgraduate

Awarness about Saudi Stem Cells Donor's Registry
0 = No
1 = Yes

Knowledge Question 1
1 = No
2 = Yes

Attitude Questions 1
1 = Strongly disagree
2 = Disagree
3 = Not sure
4 = Agree
5 = Strongly agree

Knowledge Category
1 = Low
2 = Medium
3 = High

Attitude Category
1 = Low
2 = Medium
3 = High
4 = Excellent

Age category
1 = Less than 21
2 = 21-22
3 = >22

Father's education category
1 = Upto school
2 = University degree and abive