Nadine Harker

Prof. Dr. Nadine Harker


Research Focus & Metrics

Academic Career Length

12Years (2015-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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1 September 2020 in International Journal of Drug Policy
Verified
Journal Article
Closed access
NHNadine Harker
Nadine Harker
WLWarren Covelé Lucas
Warren Covelé Lucas
RLRia Laubscher
Ria Laubscher
SDSiphokazi Dada
Siphokazi Dada
Bronwyn MyersBronwyn Myers
Bronwyn Myers
CPCharles Dh Parry
Charles Dh Parry

1 September 2016 in Substance Abuse Treatment, Prevention, and Policy
Verified
Journal Article
Open access
PDF file
NHNadine Harker
Nadine Harker
RLRia Laubscher
Ria Laubscher
SHSimon Howell
Simon Howell
MSMark Shaw
Mark Shaw
JEJodilee Erasmus
Jodilee Erasmus
LTLoraine Townsend
Loraine Townsend
South Africa continues to witness an increase in illicit poly-substance use, although a precise measurement continues to be compounded by difficulties in accessing users. In a pilot attempt to use respondent-driven sampling (RDS)—a chain referral sampling method used to access populations of individuals who are ‘hard-to-reach’—this article documents the feasibility of the method as recorded in a simultaneously run, multisite, poly-substance study in Cape Town. Here we aim to a) document the piloting of RDS among poly-substance users in the three socio-economic disparate communities targeted; b) briefly document the results; and c) review the utility of RDS as a research tool. Three cross-sectional surveys using standard RDS procedures were used to recruit active poly-substance users and were concurrently deployed in three sites. Formative research was initially conducted to assess the feasibility of the survey. To determine whether RDS could be used to successfully recruit poly-substance users, social network characteristics, such as network size was determined. A 42.5 % coupon return rate was recorded in total from 12 initial seeds. There were vast differences in the recruitment chains of individual seeds—two generated more than 90 recruits, and 2 of the 10 recruitment chains showing a length of more than 10 waves. Findings include evidence of the use of 3 or more substances in all three sites, high levels of unemployment among users, with more than a third of participants in two sites reporting arrest for drug use in the past 12 months. Our results indicate that RDS was a feasible and acceptable sampling method for recruiting participants who may not otherwise be accessible. Future studies can use RDS to recruit such cohorts, and the method could form part of broader efforts to document vulnerable populations.

Marieke TheronMarieke Theron
Marieke Theron
ESElizabeth Catherina Swart
Elizabeth Catherina Swart
MLMukhethwa Londani
Mukhethwa Londani
CPCharles D.H. Parry
Charles D.H. Parry
PWPetal Petersen Williams
Petal Petersen Williams
NHNadine Harker
Nadine Harker
Background: South Africa has a high prevalence of heavy episodic drinking (HED). Due to the high levels of alcohol misuse and violence, public hospital intensive care units were often overrun during the COVID-19 pandemic. This research investigated alcohol intake behaviour change during differing levels of lockdown restrictions, which included bans on alcohol sales. Methods: A self-reported Facebook survey ran from July to November 2020. The questions included socio-demographics, income, alcohol intake, purchasing behaviour, and reasoning. Chi-square tests/Fisher’s exact test for categorical data, Student’s t-test for normal continuous data, and the Mann–Whitney U test for non-normal data were applied. Multiple logistic regression was run for HED versus moderate drinkers. Results: A total of 798 participants took part in the survey, of which 68.4% were female. Nearly 50% of participants fell into the HED category and the majority bought alcohol illegally during restrictions. HED respondents who drank more alcohol than usual during restrictions reported that they felt stressed, needed to relax, and were bored. Conclusions: Policies intended to increase the pricing of alcohol may have the potential to reduce alcohol intake. Reducing stress and anxiety may be key to curtailing HED during emergency situations.

3 March 2022 in Substance Abuse Treatment, Prevention, and Policy
Verified
Journal Article
Open access
PDF file
NHNadine Harker
Nadine Harker
KJKim Johnson
Kim Johnson
JEJodilee Erasmus
Jodilee Erasmus
Bronwyn MyersBronwyn Myers
Bronwyn Myers
Background: The coronavirus disease 2019 (COVID-19) pandemic has impacted people with substance use disorders (SUDs) worldwide. The aim of this study was to explore, changes in the number of SUD treatment episodes provided during the height of the pandemic and, SUD treatment providers’ perceptions of the impact of COVID-19-related restrictions on people with SUDs and the delivery of SUD treatment services in South Africa. Methods: We used administrative data collected as part of the South African Community Epidemiology Network on Drug Use (SACENDU) project to assess whether the number of treatment episodes changed during the height of COVID-19 restrictions. We used data from an online survey of SUD treatment providers to assess providers’ perceptions of the impact of COVID-19 on SUD treatment delivery. Eight seven SUD facilities were recruited to participate in the online survey. Results: Sixty-three organisations (out of a total of 86) participated in the survey, yielding a 73.2% response rate. About half (n = 30; 47.6%) of the sample thought the need for SUD treatment had remained the same or had increased during the COVID-19 lockdown. Half the sample (n = 32; 50.7%) reported decreased availability of SUD services during COVID-19 lockdowns. Participants believed that the lack of services during COVID-19 lockdown impacted negatively on patients that were enrolled in their programmes and on individuals who wished to access the service. Furthermore, changes in service provision seemed to increase patients’ anxiety, exacerbate pre-existing mental health problems and in some cases were thought to precipitate relapse. In addition, patient disengagement and attrition from treatment were thought to have increased during this period. Whilst 47.6% (n = 30) of providers agreed with the value of the alcohol ban, 23.8% (n = 15) of providers thought it had unintended negative consequences. Conclusion: Based on the findings it is evident that SUD treatment services in South Africa have been significantly affected during the COVID-19 pandemic and more severely during the onset of the pandemic. Together with service providers, more effective ways should be sought on how to feasibly expand access to SUD treatment for all South Africans and enhance the country’s preparedness for future health emergencies.

NHNadine Harker
Nadine Harker
MLMukhethwa Londani
Mukhethwa Londani
NMNeo Morojele
Neo Morojele
PWPetal Petersen Williams
Petal Petersen Williams
CPCharles D.H. Parry
Charles D.H. Parry
In South Africa, little is known about alcohol consumption patterns, such as drinks consumed, container size, salience of alcohol price, affordability and availability, and perceptions of alcohol policies as potential predictors of heavy episodic alcohol (HED) use among young people. This paper examines predictors of HED among young people with specific consideration given to these alcohol consumption patterns. This study conducted in the Tshwane Metropole in 2014 employed multi-stage stratified cluster random sampling. Participants were between the ages 16–25 years. A structured questionnaire was used to collect data. Of the 287 (n = 678) participants who had used alcohol in the past six months and for whom we had complete consumption data, almost half were identified as heavy episodic drinkers (HEDs) and were significantly more likely to consume alcohol on a daily basis (p = 0.001). Having nightclub as the primary drinking location (p = 0.023) and drinking from a container size bigger than one standard drink (p = 0.014) were significant predictors for HED. HEDs were also more likely to have a perception that most people consume alcohol (p = 0.047). The results point to HED of alcohol among young people who drink in South Africa, highlighting the need for multicomponent interventions.

NHNadine Harker
Nadine Harker
JEJodilee Erasmus
Jodilee Erasmus
WLWarren Covelé Lucas
Warren Covelé Lucas
DDDiane Deitz
Diane Deitz
CBCarrie Brooke-Sumner
Carrie Brooke-Sumner
Background: The need for workplace substance use prevention programmes globally and in South Africa is driven by the growing problem of substance use and the associated burden on the health and welfare of employees, their families and organizations. Substance use, which include the non-medical use of medications (both prescription and over-the counter), remains widespread and is a major cause of mortality and a risk factor for non-communicable diseases (NCDs). Method: Twenty in-depth semi-structured qualitative interviews were conducted with employed women in treatment or shortly out of treatment for the non-medically indicated use of over the counter or/and prescription medications (NMIU). These interviews were conducted face-to face with women residing in the Western and Eastern Cape provinces of South Africa. Thematic analysis using NVIVO was used to analyse data collected. Results: The findings from this study suggest that previous use of legal or illegal substances and challenging life experiences underpin pathways to the non-medical use of over-the-counter and prescription medications among employed women. Factors found to contribute to misuse relate to a lack of understanding on risks, and health professional prescribing practices, while mitigators to harmful use were related to increased awareness and understanding harmful practices, the need for improved access and referral to specialist treatment as well as prevention programmes for women. Conclusion: With the improved understanding of the issues surrounding the NMIU of over-the-counter and prescription medications among employed women, the need for interventions to prevent misuse and inadvertently dependency is highlighted.