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Table 1 Baseline characteristics of students according to experimental group (n = 739)

From: Promoting STI testing among senior vocational students in Rotterdam, the Netherlands: effects of a cluster randomized study

 

Total group

Intervention group 1:

Education and sexual health service

Intervention group 2:

Education

Intervention group 3:

Sexual health service

Control

group

p-value*

Chi-square (df)

 

n

n = 213

n = 196

n = 183

n = 147

  

Age, average (SD)

739

18.2

(2.25)

18.5

(2.75)

17.8

(1.74)

18.1

(2.33)

18.2

(1.89)

0.15

1.76(3)e

Sex

           

0.37

3.11(3)

   Male

739

298

40.3%

62

29.1%

87

44.4%

57

31.1%

92

62.2%

  

   Female

739

441

59.7%

151

70.9%

109

55.6%

126

68.9%

55

37.4%

  

Ethnicity

739

          

0.27

3.90(3)

   Dutch

 

446

60.4%

112

52.6%

117

59.7%

114

62.3%

103

70.1%

  

   Non-Dutch

 

293

39.6%

101

47.4%

79

40.3%

69

37.7%

44

29.9%

  

Type of education

739

          

NA

 

   Health &welfare

 

357

48.3%

165

77.5%

56

28.6%

79

43.2%

57

38.8%

  

   Economic

 

286

38.7%

47

22.1%

108

55.1%

104

56.8%

27

18.4%

  

   Technical

 

96

13.0%

1

0.5%

32

16.3%

0

0%

63

42.9%

  

Has a steady relationship

732

372

50.8%

110

52.1%

96

49.7%

100

55.2%

66

44.9%

0.97

0.24(3)

Experience with vaginal intercourse

739

472

63.9%

131

61.5%

123

62.8%

118

64.5%

100

68.0%

0.99

0.098(3)

Experience with anal intercourse

739

73

9.9%

17

8.0%

24

12.3%

14

7.7%

18

12.2%

0.25

4.10(3)

Number of lifetime partners vaginal intercourse

420a

          

0.12

14.17(9)

1

 

129

30.7%

33

31.1%

36

31.0%

40

37.0%

20

22.2%

  

2

 

76

18.1%

24

22.6%

22

19.0%

17

15.7%

13

14.4%

  

3-5

 

138

32.9%

33

31, 1%

34

29.3%

37

34.3%

34

37.8%

  

6+

 

77

18.3%

16

15, 1%

24

20.7%

14

13.0%

23

25.6%

  

Number of partners vaginal intercourse in past 2 months

428b

          

0.59

4.63(6)

0

 

102

23.8%

32

29.6%

25

21.0%

21

19.3%

24

26.1%

  

1

 

279

65.2%

64

59.3%

80

67.2%

79

72.5%

56

60.9%

  

2+

 

47

11.0%

12

11.1%

14

11.8%

9

8.3%

12

13.0%

  

Condom use in last vaginal intercourse

444c

          

0.82

0.90(3)

Yes

 

230

51.8%

48

43.2%

64

52.5%

52

46.8%

50

50%

  

No

 

214

48.2%

63

56.8%

58

47.5%

59

53.2%

50

50%

  

Consistent condom use in past 2 months

292d

          

0.76

1.16(3)

Yes

 

189

64.7

17

29.3%

27

31.8%

26

33.8%

33

47.1%

  

No

 

103

35.3

43

71.7%

58

68.2%

51

66.2%

37

52.9%

  

Experience with STI testing

719

62

8.6%

23

11.0%

15

8.1%

17

9.4%

7

4.9%

< 0.001

487(3)

  1. * Real numbers and percentage are reported in this table, but p-values for differences between the groups were tested using multilevel and multinominal regression models with random effects to account for the clustering of students within classes
  2. a Selection of persons with experience in vaginal intercourse (n = 472), number of partners is missing for 52 cases (11.0%)
  3. b Selection of persons with experience in vaginal intercourse (n = 472), number of partners is missing for 44 cases (9.3%)
  4. c Selection of persons with experience in vaginal intercourse (n = 472), number of partners is missing for 28 cases (5.9%)
  5. d Selection of persons who had vaginal intercourse
  6. e F-statistic
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