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Table 2 Sexual behavior profile of Japanese non-sex worker female STI clinic attendees compared with population-based female controls

From: Demographic and behavioral characteristics of non-sex worker females attending sexually transmitted disease clinics in Japan: a nationwide case-control study

 

STI* clinic attendees (n = 145)

Population-based controls (n = 956)

 

Characteristic

n

%

n

%

pvalue†

Age at first sexual intercourse (years)

    

<0.001

   <19

105

72.4

244

25.5

 

   19 or older

38

26.2

641

67.1

 

   Missing

2

1.4

71

7.4

 

   Mean(SD*)

17.6(2.7)

 

20.5(3.3)

  

   Median

17

 

20

  

No. of partners (previous year)

    

<0.001

   1

56

38.6

871

91.1

 

   2 or 3

33

22.8

65

6.8

 

   4 or more

30

20.7

12

1.3

 

   Missing

26

17.9

8

0.8

 

Type of sex partner (previous year)

     

   Regular partner

    

0.011

Yes

139

95.9

942

98.5

 

No

6

4.1

10

1.0

 

Missing

0

0

4

0.4

 

   Casual Partner

    

<0.001

Yes

58

40.0

35

3.7

 

No

86

59.3

908

95.0

 

Missing

1

0.7

13

1.4

 

Sex with regular partners (previous year)

     

   Had unprotected vaginal sex

     

Yes

119

82.1

622

65.1

<0.001

No

17

11.7

268

28.0

 

Missing

9

6.2

66

6.9

 

   Had unprotected oral sex

     

Yes

122

84.1

524

54.8

<0.001

No

18

12.4

375

39.2

 

Missing

5

3.4

57

6.0

 

   Had unprotected anal sex

     

Yes

10

6.9

42

4.4

0.31

No

130

89.7

851

89.0

 

Missing

5

3.4

63

6.6

 

Sex with casual partners (previous year)

     

   Had unprotected vaginal sex

     

Yes

44

30.3

20

2.1

<0.001

No

94

64.8

922

96.4

 

Missing

7

4.8

14

1.5

 

   Had unprotected oral sex

     

Yes

40

27.6

17

1.8

<0.001

No

97

66.9

925

96.8

 

Missing

8

5.5

14

1.5

 

   Had unprotected anal sex

     

Yes

0

0

1

0.1

1.00

No

138

95.2

941

98.4

 

Missing

7

4.8

14

1.5

 
  1. * STI, sexually transmitted disease; SD, standard deviation
  2. †p values for chi-square test unless otherwise mentioned