CClinicalTrials.gg
CompletedNCT02461940Updated May 10, 2016

STI/HIV Prevention Intervention for Adolescents in Singapore

An interventional study of Adolescent Behavioral Intervention in Sexually Transmitted Infections, sponsored by National University of Singapore. Completed. Open to participants aged 16 Years to 19 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2016-05-10.

Sponsored by National University of Singapore · Not applicable, Interventional, and Prevention

Phase
Not applicable
Study type
Interventional
Enrollment
688
Allocation
Randomized
Ages
16 Years to 19 Years
Sex
All
01

Study summary

A randomized controlled trial conducted on 688 sexually experienced adolescents, with 337 participants assigned to the routine program, and 351 to the new intervention developed from an assessment of their needs. All participants will complete a self-administered questionnaire and an interview on their knowledge of sexually transmitted infections (STIs)/Human Immunodeficiency Virus (HIV), self-efficacy, skills in negotiating for sexual abstinence or condom use, and sexual behaviors at baseline and at 6- and 12-months' post- intervention. All will be tested for STIs. Participants in the intervention group will receive 4 individual counseling sessions on STIs/HIV knowledge, life skills, secondary abstinence, safer sex and healthy relationships over 1 year. They will also be referred to counselors for proactive social and emotional support delivered through electronic media and other means. The control group will receive the usual counseling session at first and follow-up clinic visit.

Read the detailed description

The reasons for conducting this study in a clinical setting is threefold.

  1. This is group of adolescents that has a high risk for transmitting STIs to the community. Prior to this intervention, the investigators did a preliminary study and found a high number of sex partners (median: 4, range: 1-25) and high prevalence of unprotected sex (90%) and STIs (60%) in this group. Other factors in this group that facilitate the transmission of STIs is that 36% continued to engage in unprotected sex and half of the boys (49%) and three quarters of the girls (77%) delayed seeking treatment for more than a week after experiencing symptoms of STIs. The rate at which STIs spread in a population depends upon the average number of new cases of infection generated by an infected person (the basic or case reproduction ratio (Ro). This ratio, in turn, depends upon the efficiency of transmission, (b), the mean rate of change of sexual partners (c), and the average duration of infectiousness (D) as expressed in the form: Ro=b*c*D. Given their high number of sex partners and the long duration of infectiousness owing to their delay in seeking treatment, they would form an important group for spreading STIs to the general population.
  2. The investigators are able to adopt a rigorous study design, that is, a randomized controlled trial in a clinical setting to evaluate the efficacy of the intervention, and validate self-reported behaviors with laboratory tests for STIs. In contrast, it is less feasible to conduct the study in schools presently because of the sensitivity of the topic, conservative attitudes of parents and possible biases of self-reported sexual behavior in schools. School-based interventions will also exclude school drop outs, who were found in this ongoing study, to be significantly, more likely to engage in sexual activity.
  3. The investigators have conducted needs assessment of this group and this would help in developing interventions specifically for them. For instance, the investigators found that both males and females lack the confidence of using condoms correctly. The investigators incorporated a session on instilling skills for condom use in our intervention.
02

Conditions studied

  • Sexually Transmitted Infections

Keywords

  • Sexual behavior
  • condom use
  • secondary abstinence
03

In context

Sexually Transmitted Diseases

424 studies on the registry are indexed under Sexually Transmitted Diseases; 71 are open to participants now.

This study's enrollment of 688 is above the median of 470 across 346 interventional studies indexed under Sexually Transmitted Diseases.

Browse Sexually Transmitted Diseases studies →

Lead sponsor

National University of Singapore is the lead sponsor of 206 studies on the registry; 52 are open to participants now.

Counted across the registry records on this site, refreshed daily.

04

Who can participate

Ages eligible
16 Years to 19 Years
Sexes eligible
All
Accepts healthy volunteers
Yes

Inclusion criteria

  • Singaporean citizens or permanent residents
  • Sexually active for the past 1 year
  • Heterosexual
  • Attending the clinic for the first time
  • Able to commit for one year in Singapore

Exclusion criteria

Exclusion Criteria:

  • Involved in criminal investigation
05

Study design

Phase
Not applicable
Primary purpose
Prevention
Allocation
Randomized
Intervention model
Parallel assignment
Masking
Single (Care provider)
Enrollment
688 participants (actual)

Study arms

  • No intervention
    Standard care

    The control group will receive the standard care provided by the STI clinic.

  • Active comparator
    Adolescent Behavioral intervention

    Participants allocated to the intervention arm receive 4 on-site personalised counselling and 2 phone/online sessions over a 12-month period, targeting individual, relational, sociocultural and environmental factors pertaining to the acquisition of STI/HIV.

    Behavioral: Adolescent Behavioral Intervention

Interventions

  • BehavioralAdolescent Behavioral Intervention

    Session 1 focuses on STI/HIV education and self-reflection. Session 2 aims to increase the awareness of STI/HIV preventive strategies by instilling condom use and negotiation skills. Motivational Interviewing is used during the behavioural counselling. Session 3 reviews the goal on safer sex set by the participant and examines the successful strategies on safer sex and identifies triggers for relapse. Success stories are shared to renew their motivation. Session 4 reinforces the progress of the participant by recapitulating the knowledge and motivation explored in previous sessions. The online sessions, by phone/SMS/Whatsapp are conducted 2 months after the second and third sessions to find out if they face any difficulties and to reinforce prevention information covered previously.

06

What researchers measure

Primary outcomes

  1. Consistent condom use

    This is assessed by: "Have you or your partner ever used a condom for vaginal sex in the last 6 months?" in the survey. Participants who gave the answer as 'Yes, always' are categorised as having consistent condom usage; whereas those who gave the answer as "Yes, sometimes", "No, not at all" and "Can't remember" are categorised as having inconsistent condom use.

    Time frame: 12 months

  2. Secondary abstinence

    This is assessed by: "How many times did you have vaginal sex in the last 6 months?"

    Time frame: 12 months

  3. STI incidence

    Defined as having a positive laboratory test result for a new episode of chlamydia, gonorrhoea, herpes, syphilis or HIV infection at either the 6-month or the 12-month assessment. Both gonorrhoea and chlamydia are detected by testing the urine specimens using Cobas Amplicor Polymerase Chain Reaction (PCR) assay. Type-specific serological tests (TSSTs) based on glycoprotein gG-1 and/or gG-2 are used to identify patients with genital herpes. Syphilis is screened using Enzyme Immunoassay (EIA) treponemal test. HIV rapid test is performed using the Determine HIV-1/HIV-2 (Abbott) rapid test kit, where results are available in 20 minutes. For those who do not want to wait may opt for the EIA test for HIV infection.

    Time frame: 12 months

  4. Number of sexual partners

    This is is assessed by "How many persons did you have sex with in the last 6 months?"

    Time frame: 12 months

  5. Consistent condom use

    This is assessed by: "Have you or your partner ever used a condom for vaginal sex in the last 6 months?" in the survey. Participants who gave the answer as 'Yes, always' are categorised as having consistent condom usage; whereas those who gave the answer as "Yes, sometimes", "No, not at all" and "Can't remember" are categorised as having inconsistent condom use.

    Time frame: 6 months

  6. Secondary abstinence

    This is assessed by: "How many times did you have vaginal sex in the last 6 months?"

    Time frame: 6 months

  7. STI incidence

    Defined as having a positive laboratory test result for a new episode of chlamydia, gonorrhoea, herpes, syphilis or HIV infection at either the 6-month or the 12-month assessment. Both gonorrhoea and chlamydia are detected by testing the urine specimens using Cobas Amplicor Polymerase Chain Reaction (PCR) assay. Type-specific serological tests (TSSTs) based on glycoprotein gG-1 and/or gG-2 are used to identify patients with genital herpes. Syphilis is screened using Enzyme Immunoassay (EIA) treponemal test. HIV rapid test is performed using the Determine HIV-1/HIV-2 (Abbott) rapid test kit, where results are available in 20 minutes. For those who do not want to wait may opt for the EIA test for HIV infection.

    Time frame: 6 months

  8. Number of sexual partners

    This is assessed by "How many persons did you have sex with in the last 6 months?"

    Time frame: 6 months

Secondary outcomes

  1. Success in stopping pressured sex

    This is assessed by: "If a boy/ girl puts pressure on you to be involved sexually and you don't want to be involved, how often do you succeed in stopping it?"

    Time frame: 12 months

  2. Confidence in using condoms correctly

    This is assessed by "How confident are you that you are using the condom correctly?" and rated on a scale ranging from "not confident at all" to "very confident"

    Time frame: 12 months

  3. Confidence in negotiating for condom use

    This is evaluated by "How confident are you that you are able to persuade your boyfriend/girlfriend to use condom?"

    Time frame: 12 months

  4. Success in stopping pressured sex

    This is assessed by: "If a boy/ girl puts pressure on you to be involved sexually and you don't want to be involved, how often do you succeed in stopping it?"

    Time frame: 6 months

  5. Confidence in using condoms correctly

    This is assessed by "How confident are you that you are using the condom correctly?" and rated on a scale ranging from "not confident at all" to "very confident"

    Time frame: 6 months

  6. Confidence in negotiating for condom use

    This is evaluated by "How confident are you that you are able to persuade your boyfriend/girlfriend to use condom?"

    Time frame: 6 months

07

Study locations

No study locations are listed for this record.

08

References and documents

Publications

  • Wong ML, Chan RK, Koh D, Tan HH, Lim FS, Emmanuel S, Bishop G. Premarital sexual intercourse among adolescents in an Asian country: multilevel ecological factors. Pediatrics. 2009 Jul;124(1):e44-52. doi: 10.1542/peds.2008-2954. PubMed 19564268 ↗
  • Wong ML, Chan RK, Tan HH, Sen P, Chio M, Koh D. Gender differences in partner influences and barriers to condom use among heterosexual adolescents attending a public sexually transmitted infection clinic in Singapore. J Pediatr. 2013 Mar;162(3):574-80. doi: 10.1016/j.jpeds.2012.08.010. Epub 2012 Sep 20. PubMed 23000347 ↗
  • Kipke MD, Boyer C, Hein K. An evaluation of an AIDS risk reduction education and skills training (ARREST) program. J Adolesc Health. 1993 Nov;14(7):533-9. doi: 10.1016/1054-139x(93)90136-d. PubMed 8312288 ↗
  • Sen P, Chio MT, Tan HH, Chan RK. Rising trends of STIs and HIV infection in Singapore-- a review of epidemiology over the last 10 years (1994 to 2003). Ann Acad Med Singap. 2006 Apr;35(4):229-35. PubMed 16710492 ↗
  • Wong ML, Sen P, Wong CM, Tjahjadi S, Govender M, Koh TT, Yusof Z, Chew L, Tan A, K V. Human immunodeficiency virus (HIV) prevention education in Singapore: challenges for the future. Ann Acad Med Singap. 2012 Dec;41(12):602-9. PubMed 23303119 ↗
  • Ng JYS, Chan RKW, Chio MT, Lim RBT, Koh D, Wong ML. An Abstinence and Safer Sex Intervention for Adolescents Attending the Public Sexually Transmitted Infection Clinic in Singapore. J Adolesc Health. 2018 Jun;62(6):737-746. doi: 10.1016/j.jadohealth.2017.12.014. Epub 2018 Apr 13. PubMed 29661642 ↗
09

Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on May 10, 2016, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
10

Registry details

Key details

Study ID
NCT02461940
Lead sponsor
National University of Singapore
Collaborators
National Medical Research Council (NMRC), Singapore, National Skin Centre, Singapore
Responsible party
Wong Mee Lian (Associate Professor, National University of Singapore) — Principal investigator
First posted
Jun 3, 2015
Start date
Nov 2009
Primary completion
Jan 2016
Completion
Jan 2016
Last update
May 10, 2016

Study contacts

Mee-Lian Wong, MPH, MD
principal investigator · National University of Singapore

Oversight

Data monitoring committee
Yes
View the source record on ClinicalTrials.gov ↗

Not currently enrolling

This study is completed, as verified in May 2016. You cannot join it, but the record below documents what was studied.

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