Age at first intercourse, number of partners and sexually transmitted infection prevalence among Danish, Norwegian and Swedish women: estimates and trends from nationally representative cross-sectional surveys of more than 100 000 women

Bo T. Hansen, Susanne K. Kjær, Lisen Arnheim-Dahlström, Kai Li Liaw, Kirsten E. Juul, Louise T. Thomsen, Kirsten Frederiksen, K. Miriam Elfström, Christian Munk, Mari Nygård

Research output: Contribution to journalArticle

Abstract

Introduction: Sexual behavior at the population level impacts on public health. Recent representative sexual behavior data are lacking. Material and methods: Cross-sectional surveys in 2005 and 2012 on women age 18-45 years randomly selected from the general population in Denmark (n = 40 804), Norway (n = 30 331) and Sweden (n = 32 114). Results: Median (interquartile range) age at first intercourse was 16 (15-18) years in Denmark, 17 (16-18) years in Norway, and 17 (15-18) years in Sweden. Women in the most recent birth cohort had sexual debut at the lowest age, and were most likely to have sexual debut before the legal age of consent. Proportions with debut age ≤14 years among women born 1989-1994 vs 1971-1976, odds ratio (95% confidence interval) were: 18.4% vs 10.9%, 1.95 (1.74-2.18) in Denmark, 12.9% vs 6.3%, 2.38 (2.01-2.82) in Norway, 17.8% vs 11.4%, 1.75 (1.55-1.98) in Sweden. Median (interquartile range) number of lifetime sexual partners was 6 (3-10) in Denmark, 5 (2-10) in Norway, and 6 (3-11) in Sweden. The proportion of women reporting >10 sexual partners was also highest in the most recent survey. The percentage with odds ratio (95% confidence interval) in 2012 vs 2005 surveys were: 24.9% vs 22.8%, 1.13 (1.07-1.18) for Denmark; 23.8% vs 19.8%, 1.27 (1.19-1.34) for Norway; and 28.3% vs 23.8%, 1.31 (1.24-1.38) for Sweden. Similarly, the proportion of women reporting ever having had a sexually transmitted infection among women age <30 years were: 29.4% vs 26.4%, 1.21 (1.13-1.31) in Denmark, 28.9% vs 25.0%, 1.20 (1.10-1.31) in Norway, and 29.4% vs 22.2%, 1.45 (1.33-1.58) in Sweden. Conclusions: Scandinavian women reported lower age at first intercourse in younger birth cohorts. Moreover, they reported more lifetime sexual partners and a higher prevalence of ever having a sexually transmitted infection in 2012 than in 2005. Our findings may inform the interpretation of trends in outcomes associated with sexual health, and public health policies.

Original languageEnglish (US)
Pages (from-to)175-185
Number of pages11
JournalActa Obstetricia et Gynecologica Scandinavica
Volume99
Issue number2
DOIs
StatePublished - Feb 1 2020

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Coitus
Sexually Transmitted Diseases
Denmark
Norway
Sweden
Cross-Sectional Studies
Sexual Partners
Sexual Behavior
Public Health
Odds Ratio
Parturition
Confidence Intervals
Reproductive Health
Public Policy
Health Policy
Population

Keywords

  • first intercourse
  • lifetime sexual partners
  • sexual behavior
  • sexual debut
  • sexual health
  • sexually transmitted infection

ASJC Scopus subject areas

  • Obstetrics and Gynecology

Cite this

Age at first intercourse, number of partners and sexually transmitted infection prevalence among Danish, Norwegian and Swedish women : estimates and trends from nationally representative cross-sectional surveys of more than 100 000 women. / Hansen, Bo T.; Kjær, Susanne K.; Arnheim-Dahlström, Lisen; Liaw, Kai Li; Juul, Kirsten E.; Thomsen, Louise T.; Frederiksen, Kirsten; Elfström, K. Miriam; Munk, Christian; Nygård, Mari.

In: Acta Obstetricia et Gynecologica Scandinavica, Vol. 99, No. 2, 01.02.2020, p. 175-185.

Research output: Contribution to journalArticle

Hansen, Bo T. ; Kjær, Susanne K. ; Arnheim-Dahlström, Lisen ; Liaw, Kai Li ; Juul, Kirsten E. ; Thomsen, Louise T. ; Frederiksen, Kirsten ; Elfström, K. Miriam ; Munk, Christian ; Nygård, Mari. / Age at first intercourse, number of partners and sexually transmitted infection prevalence among Danish, Norwegian and Swedish women : estimates and trends from nationally representative cross-sectional surveys of more than 100 000 women. In: Acta Obstetricia et Gynecologica Scandinavica. 2020 ; Vol. 99, No. 2. pp. 175-185.
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abstract = "Introduction: Sexual behavior at the population level impacts on public health. Recent representative sexual behavior data are lacking. Material and methods: Cross-sectional surveys in 2005 and 2012 on women age 18-45 years randomly selected from the general population in Denmark (n = 40 804), Norway (n = 30 331) and Sweden (n = 32 114). Results: Median (interquartile range) age at first intercourse was 16 (15-18) years in Denmark, 17 (16-18) years in Norway, and 17 (15-18) years in Sweden. Women in the most recent birth cohort had sexual debut at the lowest age, and were most likely to have sexual debut before the legal age of consent. Proportions with debut age ≤14 years among women born 1989-1994 vs 1971-1976, odds ratio (95{\%} confidence interval) were: 18.4{\%} vs 10.9{\%}, 1.95 (1.74-2.18) in Denmark, 12.9{\%} vs 6.3{\%}, 2.38 (2.01-2.82) in Norway, 17.8{\%} vs 11.4{\%}, 1.75 (1.55-1.98) in Sweden. Median (interquartile range) number of lifetime sexual partners was 6 (3-10) in Denmark, 5 (2-10) in Norway, and 6 (3-11) in Sweden. The proportion of women reporting >10 sexual partners was also highest in the most recent survey. The percentage with odds ratio (95{\%} confidence interval) in 2012 vs 2005 surveys were: 24.9{\%} vs 22.8{\%}, 1.13 (1.07-1.18) for Denmark; 23.8{\%} vs 19.8{\%}, 1.27 (1.19-1.34) for Norway; and 28.3{\%} vs 23.8{\%}, 1.31 (1.24-1.38) for Sweden. Similarly, the proportion of women reporting ever having had a sexually transmitted infection among women age <30 years were: 29.4{\%} vs 26.4{\%}, 1.21 (1.13-1.31) in Denmark, 28.9{\%} vs 25.0{\%}, 1.20 (1.10-1.31) in Norway, and 29.4{\%} vs 22.2{\%}, 1.45 (1.33-1.58) in Sweden. Conclusions: Scandinavian women reported lower age at first intercourse in younger birth cohorts. Moreover, they reported more lifetime sexual partners and a higher prevalence of ever having a sexually transmitted infection in 2012 than in 2005. Our findings may inform the interpretation of trends in outcomes associated with sexual health, and public health policies.",
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author = "Hansen, {Bo T.} and Kj{\ae}r, {Susanne K.} and Lisen Arnheim-Dahlstr{\"o}m and Liaw, {Kai Li} and Juul, {Kirsten E.} and Thomsen, {Louise T.} and Kirsten Frederiksen and Elfstr{\"o}m, {K. Miriam} and Christian Munk and Mari Nyg{\aa}rd",
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T2 - estimates and trends from nationally representative cross-sectional surveys of more than 100 000 women

AU - Hansen, Bo T.

AU - Kjær, Susanne K.

AU - Arnheim-Dahlström, Lisen

AU - Liaw, Kai Li

AU - Juul, Kirsten E.

AU - Thomsen, Louise T.

AU - Frederiksen, Kirsten

AU - Elfström, K. Miriam

AU - Munk, Christian

AU - Nygård, Mari

PY - 2020/2/1

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N2 - Introduction: Sexual behavior at the population level impacts on public health. Recent representative sexual behavior data are lacking. Material and methods: Cross-sectional surveys in 2005 and 2012 on women age 18-45 years randomly selected from the general population in Denmark (n = 40 804), Norway (n = 30 331) and Sweden (n = 32 114). Results: Median (interquartile range) age at first intercourse was 16 (15-18) years in Denmark, 17 (16-18) years in Norway, and 17 (15-18) years in Sweden. Women in the most recent birth cohort had sexual debut at the lowest age, and were most likely to have sexual debut before the legal age of consent. Proportions with debut age ≤14 years among women born 1989-1994 vs 1971-1976, odds ratio (95% confidence interval) were: 18.4% vs 10.9%, 1.95 (1.74-2.18) in Denmark, 12.9% vs 6.3%, 2.38 (2.01-2.82) in Norway, 17.8% vs 11.4%, 1.75 (1.55-1.98) in Sweden. Median (interquartile range) number of lifetime sexual partners was 6 (3-10) in Denmark, 5 (2-10) in Norway, and 6 (3-11) in Sweden. The proportion of women reporting >10 sexual partners was also highest in the most recent survey. The percentage with odds ratio (95% confidence interval) in 2012 vs 2005 surveys were: 24.9% vs 22.8%, 1.13 (1.07-1.18) for Denmark; 23.8% vs 19.8%, 1.27 (1.19-1.34) for Norway; and 28.3% vs 23.8%, 1.31 (1.24-1.38) for Sweden. Similarly, the proportion of women reporting ever having had a sexually transmitted infection among women age <30 years were: 29.4% vs 26.4%, 1.21 (1.13-1.31) in Denmark, 28.9% vs 25.0%, 1.20 (1.10-1.31) in Norway, and 29.4% vs 22.2%, 1.45 (1.33-1.58) in Sweden. Conclusions: Scandinavian women reported lower age at first intercourse in younger birth cohorts. Moreover, they reported more lifetime sexual partners and a higher prevalence of ever having a sexually transmitted infection in 2012 than in 2005. Our findings may inform the interpretation of trends in outcomes associated with sexual health, and public health policies.

AB - Introduction: Sexual behavior at the population level impacts on public health. Recent representative sexual behavior data are lacking. Material and methods: Cross-sectional surveys in 2005 and 2012 on women age 18-45 years randomly selected from the general population in Denmark (n = 40 804), Norway (n = 30 331) and Sweden (n = 32 114). Results: Median (interquartile range) age at first intercourse was 16 (15-18) years in Denmark, 17 (16-18) years in Norway, and 17 (15-18) years in Sweden. Women in the most recent birth cohort had sexual debut at the lowest age, and were most likely to have sexual debut before the legal age of consent. Proportions with debut age ≤14 years among women born 1989-1994 vs 1971-1976, odds ratio (95% confidence interval) were: 18.4% vs 10.9%, 1.95 (1.74-2.18) in Denmark, 12.9% vs 6.3%, 2.38 (2.01-2.82) in Norway, 17.8% vs 11.4%, 1.75 (1.55-1.98) in Sweden. Median (interquartile range) number of lifetime sexual partners was 6 (3-10) in Denmark, 5 (2-10) in Norway, and 6 (3-11) in Sweden. The proportion of women reporting >10 sexual partners was also highest in the most recent survey. The percentage with odds ratio (95% confidence interval) in 2012 vs 2005 surveys were: 24.9% vs 22.8%, 1.13 (1.07-1.18) for Denmark; 23.8% vs 19.8%, 1.27 (1.19-1.34) for Norway; and 28.3% vs 23.8%, 1.31 (1.24-1.38) for Sweden. Similarly, the proportion of women reporting ever having had a sexually transmitted infection among women age <30 years were: 29.4% vs 26.4%, 1.21 (1.13-1.31) in Denmark, 28.9% vs 25.0%, 1.20 (1.10-1.31) in Norway, and 29.4% vs 22.2%, 1.45 (1.33-1.58) in Sweden. Conclusions: Scandinavian women reported lower age at first intercourse in younger birth cohorts. Moreover, they reported more lifetime sexual partners and a higher prevalence of ever having a sexually transmitted infection in 2012 than in 2005. Our findings may inform the interpretation of trends in outcomes associated with sexual health, and public health policies.

KW - first intercourse

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