Table 2 Characteristics of newly reached participants and previously tested participants

Age

  ≤ 21

28.7 (1233)

19.1 (196)

1.63 (1.4-2.0)

1.8 (1.5-2.2)

<0.001

  22-24

33.8 (1451)

40.1 (411)

0.9 (0.8-1.1)

1.0 (0.8-1.1)

0.56

  25-29

37.6 (1614)

40.8 (418)

1

1

Sex

  Men

38.3 (1646)

18.7 (192)

2.7 (2.3-3.2)

2.9 (2.5-3.4)

<0.001

  Women

61.7 (2652)

81.3 (833)

1

1

Chlamydia

  Yes

4.8 (204)

4.5 (46)

1.1 (0.8-1.5)

ns

  No

1

Nationality

  Non-Western

2.6 (111)

3.3 (34)

0.8 (0.5-1.2)

  Western

96.7 (990)

97.4 (4159)

1

ns

Restricted analyses

Age

  ≤ 21

30.7 (783)

20.2 (123)

1.7 (1.4-2.2)

1.7 (1.3-2.2)

<0.001

  22-24

33.0 (842)

39.2 (239)

0.9 (0.8-1.2)

1.0 (0.8-1.2)

0.78

  25-29

36.3 (927)

40.7 (248)

1

1

1

Sex

  Men

32.4 (827)

15.1 (92)

2.7 (2.1-3.4)

ns

  Women

67.6 (1725)

84.9 (518)

1

Chlamydia

  Yes

5.9 (150)

6.1 (37)

1.0 (0.7-1.4)

ns

  No

94.1 (2402)

93.9 (573)

1

Sexual preference

  Men who have sex with men

1.7 (39)

0.9 (5)

2.3 (0.9-5.9)

4.0 (1.6-10.6)

<0.01

  Heterosexual men

30.4 (715)

13.8 (77)

2.8 (2.2-3.6)

3.3 (2.6-4.3)

<0.001

  Women

67.9 (1598)

85.3 (477)

1

1

Sex partners

  1

73.3 (1713)

63.8 (353)

1.8 (1.4-2.4)

2.6 (1.9-3.4)

<0.001

  2

15.9 (371)

19.2 (106)

1.3 (0.9-1.8)

1.7 (1.2-2.4)

<0.01

  ≥3

10.8 (253)

17.0 (94)

1

1

Symptoms

  Yes

2.4 (62)

3.0 (18)

1.3 (0.8-2.1)

ns

  No

97.6 (2490)

97.0 (592)

1