The objective of this study was to measure HIV screening rates and variables associated with screening among new enrollees in California's Low Income Health Program (LIHP). A logit model was used to estimate associations between HIV screening and enrollment, claims, and encounter data for enrollees. HIV prevalence among new LIHP enrollees was 1.2%xd. Among 42,550 new LIHP enrollees with no prior HIV diagnosis, only 27% received screening within 12 months of their first medical evaluation. A total of 350 new HIV diagnoses were identified (incidence rate of 0.8%), exceeding the 0.1% level at which the Centers for Disease Control and Prevention (CDC) recommends routine HIV screening. California reduced screening barriers by removing required written informed consent and pretest counseling; the Affordable Care Act (ACA) eliminated cost-sharing and enhanced access. Removing financial and administrative barriers to HIV screening is necessary, but may be insufficient to reach CDC's recommended screening targets.

Aims

Methamphetamine Use Disorder is prevalent in South Africa. This analysis uses data from a contingency management (CM) pilot study in South Africa to replicate and expand on a U.S.-based study showing that CM voucher spending was associated with drug abstinence behavior.

Design

Participants with methamphetamine-use disorder were enrolled in an 8-week CM trial requiring thrice weekly visits and received cash vouchers in exchange for stimulant-negative urines at each visit.

Participants

Participants were 33 treatment-seeking individuals with methamphetamine use disorder including 22 men (66.7%) and 11 women (33.3%) with a mean age of 34 years (S.D. = 7.7). Participants reported using methamphetamine for a mean of 11.7 years (S.D. = 4.9).

Setting

All study procedures took place in South Africa between August 2016 and May 2018.

Measurements

A time-lagged counting process Cox Proportional Hazards model for recurrent event survival analysis examined the relationship between frequency of and participant-categorized type of CM expenditures (hedonic, utilitarian, consumable or durable) and drug abstinence.

Findings

After controlling for severity of baseline methamphetamine use and accumulated CM earnings (proxied by cumulative negative urines), those spending CM earnings at a previous visit ("spenders") were more likely to produce stimulant-negative urine samples subsequently, compared to those who did not ("savers") [OR = 1.23, CI = 1.08-1.53, p = .002]. There were significantly more cumulative stimulant-negative results among spenders vs. savers, p < .001, although cumulative spending did not significantly predict abstinence once spending in the prior time period was controlled for, suggesting a recency effect tied to the underlying spending mechanism. When extending the original analyses to look at the effect of spending on current abstinence, controlling only for recent abstinence (rather than cumulative abstinence), spending was no longer a significant predictor. Spending type did not affect methamphetamine abstinence. Qualitative results suggest spending CM vouchers may support social reintegration over the course of the trial.

Conclusions

Abstinence outcomes are a function of CM spending in both the U.S. and South Africa. Findings of a significant relationship between contingency management spending and subsequent stimulant-negative urine samples across geographic locations provide guidance toward future work in optimizing CM efficacy.