Middle school students (N = 1594)

High school students

(N = 1900)

University students

(N = 1257)

Total¹

(N = 4751)

M

SD

M

SD

M

SD

M

SD

F

p

Scheffe post hocs²

HIV/AIDS Knowledge (N = 4288)

4.2

2.56

6.2

2.27

7.8

1.08

6.0

2.52

929.413

.000

a < b < c

Attitudes towards HIV-infected people (N = 4340)

12.2

2.28

13.4

2.08

14.6

1.07

13.4

2.13

512.684

.000

a < b < c

Attitudes towards condoms (N = 4300)

8.2

2.55

9.2

2.37

10.0

2.15

9.1

2.50

188.915

.000

a < b < c