Elsevier

Contraception

Volume 75, Issue 1, January 2007, Pages 59-65
Contraception

Original research article
Audio computer-assisted self-interviewing in reproductive health research: reliability assessment among women in Harare, Zimbabwe,☆☆

https://doi.org/10.1016/j.contraception.2006.07.002Get rights and content

Abstract

Purpose

Research on the measurement of HIV risk demonstrates that interview mode can affect reporting; however, few studies have applied these findings to assessments of hormonal contraceptive use. This paper examines how audio computer-assisted self-interviewing (ACASI) influenced reports of hormonal contraceptive use and pregnancy among Zimbabwean women.

Methods

Using a prospective, randomized, cross-over design, we compared self-reports obtained with ACASI and face-to-face (FTF) interview among 655 women enrolled in a prospective study on hormonal contraceptive use and HIV acquisition. In addition, self-report data were compared to those collected during clinical exams.

Results

Compared to FTF interviews, reports of hormonal contraceptive use were lower in ACASI [odds ratio (OR)=0.6; 95% confidence interval (95% CI)=0.5–0.6], and reports of pregnancy were higher (OR=1.5; 95% CI=1.1–1.9). Both modes of self-report differed from records on contraceptive method disbursement.

Conclusion

Although ACASI yielded higher reports of several reproductive health behaviors, discrepancies between self-reports and clinical data on method disbursement highlight persistent measurement challenges.

Introduction

The challenge of accurately measuring reproductive health behaviors has received substantial attention in the context of HIV prevention research [1], [2]. With no gold standards, reliability studies have aimed to improve the accuracy of self-reports through the modification of interview mode (e.g., self-administered vs. interviewer-administered instruments) and to strengthen assessments of self-reported behavioral risks, such as condom-use practices, with biological markers of sexual activity [e.g., Y chromosome, prostate-specific antigen (PSA)] [3], [4], [5]. Relatively few studies, however, have addressed the reliability of self-reports on the use of hormonal contraceptive methods. Accurate data on contraceptive use are needed both to calculate the effectiveness rates of methods and to minimize misclassification in observational epidemiologic studies, which, particularly for low-magnitude associations, can introduce biases that render interpretation of such associations tenuous [6].

Most methodological studies of contraceptive method use have investigated the extent of recall bias in self-reported use by comparing reports (both in self-administered and interviewer-administered paper questionnaires) to clinic records [7], [8], [9], [10]. An evaluation of reported oral contraceptive use in the Nurses' Health Study against pharmacist records found that reports of pharmacology and dose were concordant for 75% of sampled respondents [11]. Another study on compliance to oral contraceptive method, which compared the diary data of daily pill use to data from electronic dispensers, demonstrated that diary data were susceptible to social desirability and recall biases (depending on when respondents actually completed their diaries). Reports of missed pills were concordant for only 45% of participants, with women reporting fewer pills missed in diaries than in electronic data [12].

Research on measurements of the use of barrier methods for HIV prevention has shown that interview methods that increase both the privacy and the anonymity of the interview context can increase reports of high-risk behaviors, particularly those that may be embarrassing, stigmatizing or illegal [1], [13]. Audio computer-assisted self-interviewing (ACASI), which achieves the privacy of a self-administered questionnaire [14] but allows for complex and consistent questionnaire administration, has become more widely used because it appears to yield more accurate self-reports for the most sensitive behaviors [15], [16], [17], [18], [19], [20], [21], [22], [23].

Nearly all studies examining ACASI, though, focused primarily on HIV prevention behaviors by using a cross-sectional design and were conducted in the United States or Great Britain. With the exception of one recent study among Kenyan adolescents [24], which found inconsistent effects of ACASI on reports of HIV risk behaviors, this study is among the first investigations of ACASI to be carried out in sub-Saharan Africa and the first to examine hormonal contraceptive use.

In the context of a prospective cohort study of hormonal contraceptive use and HIV acquisition (HC–HIV Study) [25], we conducted a prospective, randomized, cross-over study among women in Zimbabwe to examine misclassification of exposure, hormonal contraceptive use and related reproductive health risks. We compared self-reports obtained through ACASI and face-to-face (FTF) questionnaires and examined the concordance of self-reports and clinical data on contraceptive method disbursement.

Section snippets

Study population

This study was ancillary to the multisite HC–HIV Study conducted among a cohort of HIV-negative women in Zimbabwe, Uganda and Thailand. Because previous research conducted in Zimbabwe had indicated the acceptability of ACASI methods [26], this substudy was added to the Zimbabwe site only. The ACASI Study was conducted in two periurban communities outside Harare: Epworth and Chitungwiza. Eligible women were 18–35 years old, sexually active, HIV-negative and agreed to be tested for HIV every 3

Study participant characteristics

The HC–HIV Study Zimbabwe cohort enrolled 1092 women from the two clinical sites where we conducted the ACASI Study. The ACASI Study included 655 women, or 59.9% of the total seen in these clinics. ACASI Study participants appear to be representative of the overall HC–HIV cohort; none of the background characteristics or sexual history factors examined differed between ACASI Study participants and the remaining cohort members. Follow-up rates were 90.2% for Visit 2, 89.3% for Visit 3 and 82.5%

Discussion

Assuming that higher reports of sensitive behaviors are more accurate, our findings generally suggest that ACASI can minimize social desirability bias. Reports of hormonal contraceptive use — the main exposure examined by the parent study — appeared to be influenced by interview mode, with lower reports of use in ACASI interviews than in FTF interviews. That lower reported use of hormonal contraceptives was found in ACASI for the pill and Depo-Provera cohorts, but not for the nonhormonal cohort

Acknowledgments

We would like to acknowledge the study interviewers and data clerks for their tremendous contributions to recruitment and data collection, and Mavis Rimai for superb data entry and management assistance. Dr. Minnis also would like to thank Drs. Arthur Reingold and Lorraine Midanik, professors at UC Berkeley, for reviewing an earlier version of this manuscript (as part of her doctoral dissertation) and for guiding its analysis and interpretation. Thanks are extended to Markus Steiner for his

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    This project has been funded with federal funds from the National Institute of Child Health and Human Development, National Institutes of Health, Department of Health and Human Services through a contract with Family Health International (contract no. N01-HD-0-3310).

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    The content of this publication does not necessarily reflect the views or policies of the Department of Health and Human Services or of Family Health International, nor does mention of trade names, commercial products, or organizations imply endorsement by the US Government.

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