Table 4 Main channels of HIV/AIDS health education in 2006 and 2016 (%)

Lecture

65.26

46.57

− 18.69

56.26

82.635

< 0.001

Elective course

17.95

28.58

10.64

23.07

37.106

< 0.001

Compulsory course

13.23

18.52

5.29

15.78

12.249

< 0.001

Lecture or Course

83.67

89.70

6.04

87.44

37.335

< 0.001

Publicity material

54.01

47.20

− 6.82

50.73

10.823

0.001

Peer education

45.00

20.30

− 24.69

33.10

160.304

< 0.001

Window and bulletin board

32.34

30.54

− 1.80

31.48

0.872

0.350

Others

1.16

2.05

0.89

1.59

2.982

0.084