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Table 1 Prevalence of genital chlamydia infection and socio-demographic factors and health care utilisation, sexual behaviour and self-reported STIs among men and women aged 18–25 years in Rogaland, Norway. N = 1535

From: Population based study of genital Chlamydia trachomatis prevalence and associated factors in Norway: A cross sectional study

   Men (n = 605) Women (n = 930)
n/N % 95% CI n/N % 95% CI
Age 18-21 16/254 6.3 3.9-10.0 30/453 6.6 4.7-9.3
  22-25 15/351 4.3 2.6-6.9 24/477 5.1 3.4-7.4
Marital status Single 30/550 5.5 3.8-7.7 54/817 6.6 5.1-8.5
  Married 1/55 1.8 0.3-9.6 0/113 0 0-3.2
Education, years ≤14 29/490 5.9 4.2-8.4 45/675 6.7 5.0-8.8
  15+ 2/115 1.7 0.5-6.1 9/255 3.5 1.9-6.6
Occupation Employed 18/339 5.3 3.4-8.2 23/336 6.8 4.6-10.1
  Unemployed 4/27 14.8 5.9-32.5 4/37 10.8 4.3-24.7
  Student/pupil 8/197 4.1 2.7-7.8 20/479 4.2 2.7-6.4
  Other/Unknown 1/42 2.4 0.4-12.3 7/78 9.0 4.4-17.4
Country of birth Norway 28/575 4.9 3.4-7.0 52/876 5.9 4.6-7.7
  Europe/North America 0/13 0 0-22.8 0/29 0 0.11.7
  Other countries 3/17 17.6 0.4-12.3 2/29 8.8 3.0-23.0
Presence of a youth clinic in municipality Yes 20/307 6.5 4.3-9.9 38/589 6.5 4.7-8.7
No 5/15 33.3 15.2-58.3 1/50 2.0 0.4-10.5
  Do not know 6/283 2.1 1.0-4.6 15/291 5.2 3.2-8.3
Using youth clinic services Yes 2/66 3.0 0.8-10.4 23/312 7.4 5.0-10.8
No 29/539 5.4 3.8-7.6 31/618 5.0 3.6-7.0
Consulted a family doctor on STI Yes 14/191 7.3 4.4-11.9 33/514 6.4 4.6-8.9
  No 17/414 4.1 2.6-6.5 21/416 5.0 3.3-7,6
Number of partners during last year 0 1/24 4.2 0.7-20.2 0/14 0 0-21.5
1 2/303 0.7 0.2-2.4 15/563 2.7 1.6-4.4
  2-3 11/154 7.1 4.0-12.3 19/222 8.6 5.6-13.0
  4-5 9/66 13.6 7.3-23.9 12/83 14.5 8.5-23.6
  5+ 8/58 13.8 7.2-24.9 8/48 16.7 8.7-29.6
Total number of partners 1 0/114 0 0-3.3 0/184 0 0-2.1
  2-3 3/130 2.3 0.8-6.6 5/212 2.4 1.0-5.4
  4-5 1/103 1.0 0.2-5.3 5/157 3.2 1.4-7.2
  6-10 11/124 8.9 5.0-15.2 23/215 10.7 7.2-15.5
  10+ 16/134 11.9 7.5-18.5 21/162 13.0 8.6-19.0
Previoulsy tested for chlamydia Yes 11/161 6.8 3.9-11.8 35/510 6.9 5.0-9.4
  No 20/444 4.5 2.9-6.9 19/420 4.5 2.9-7.0
Previously diagnosed with chlamydia Yes 4/57 7.0 2.8-16.7 19/152 12.5 8.2-18.7
  No 27/548 4.9 3.4-7.1 35/778 4.5 3.5-6.2
Previoulsy diagnosed with genital warts Yes 3/40 7.5 2.6-19.9 1/64 1.6 0.3-8.3
No 28/565 5.0 3.5-7.1 53/866 6.1 4.7-7.9
Previously diagnosed with genital herpes Yes 2/2 100 0.34-100 0/16 0 0-19.4
  No 29/603 4.8 3.4-6.8 54/914 5.9 4.6-7.6
Presence of symptoms Yes 10/83 12.0 6.7-20.8 20/329 6.1 4.0-9.2
  No 21/522 4.0 2.7-6.1 34/601 5.7 4.1-7.8
Sex with a person of the same sex Yes 0/28 0 0-12.1 5/65 7.7 3.3-16.8
  No 31/577 5.4 3.8-7.5 49/865 5.7 4.3-7.4
Method with casual partner No contraception 12/136 8.8 5.1-14.8 10/99 10.1 5.6-17.6
  Condom 7/135 5.2 2.5-10.3 9/134 6.7 3.6-12.2
  Hormonal 8/135 5.9 3.0-11.3 29/345 8.4 5.9-11.8
  Other 4/199 2.0 0.8-5.0 6/352 1.7 0.8-3.7
Method with long-term partner No contraception 8/114 7.0 3.6-13.2 11/129 8.5 4.8-14.6
  Condom 4/86 4.7 1.8-11.4 1/83 1.2 0.2-6.5
  Hormonal 15/331 4.5 2.8-7.3 34/588 5.8 4.2-8.0
  Other 4/74 5.4 2.1-13.1 8/130 6.2 3.2-11.7
Constant partner Yes 8/297 2.7 1.4-5.2 22/520 4.2 2.8-6.3
  No 23/308 7.5 5.0-11.0 32/410 7.8 5.6-10.8