Discordant and Concordant Substance Use and Daily Partner Violence in Adolescent and Young Adult Relationships With Baseline Dating Violence.

PURPOSE: Intimate partner violence (IPV) and substance use in adolescents and young adults (AYAs) are significant public health issues in the United States. Together, they can harm emotional regulation and romantic relationship functioning. This study examines the role of concordant and discordant substance use on IPV within AYA relationships. METHODS: A prospective cohort of community-recruited AYA women in a heterosexual dating relationship with past-month IPV completed four months of daily surveys via a cell phone. Each day, participants reported any IPV perpetration and/or victimization, their alcohol and drug use, and observed partner substance use. Concordant substance use was coded when the participant and partner used drugs or alcohol on the same day. Discordant use was coded when only the participant or partner used drugs or alcohol on a given day. Alcohol and drug use were modeled separately. Generalized estimating equations accounted for the correlation of repeated measures. RESULTS: Participants (N = 143) were 18.2 (1.1) years old, 93% African American race. Discordant alcohol and drug use was associated with same-day victimization, perpetration, and co-occurring violence compared to concordant nonuse. Similarly, concordant alcohol use, drug use, and alcohol/drug use were associated with increased odds of victimization, perpetration, and co-occurring violence compared to concordant nonuse. DISCUSSION: Daily data illustrated that dyadic patterns of substance use are associated with IPV. These findings may facilitate the development of effective and developmentally appropriate IPV intervention programs for AYA that also integrate strategies to reduce substance use.

Exploring association of mobile phone access with positive health outcomes and behaviors amongst post-partum mothers in rural Malawi.

BACKGROUND: Access to mass media and emerging technologies (e.g., cell phones, the internet, and social media) is a social determinant of health that has been shown to profoundly influence women's health outcomes. In the African region, where women in rural settings with limited access to care are most vulnerable to maternal mortality and other pregnancy-related morbidities, mobile phone access can be an important and life-saving health determinant. OBJECTIVE: The goal of this study was to examine the association between mobile/cellular phone ownership and health behaviors of post-partum mothers in rural Malawi. METHODS: In this cross-sectional study, we recruited and consented a convenient sample of 174 post-partum mothers of 4- and 5-month-olds who were attending well-child clinics in Gowa, situated in the rural Ntcheu district of Malawi. Using logistic regression models, we hypothesized that compared to non-cell phone owners, mobile phone ownership will be predictive (greater odds) of antenatal visit frequency, exclusive breastfeeding knowledge and practices, health-seeking behaviors, and involvement in motherhood support groups; and protective (lower odds) of infant illnesses, breastfeeding challenges, and post-partum depressive symptoms. RESULTS: Mobile phones were highly prevalent in this rural setting, with 45% (n = 79) of post-partum women indicating they owned at least one cell phone. Cell phone owners tended to have higher levels of education (p < 0.012) and wealth (p < 0.001). Interestingly, mobile phone ownership was only associated with exclusive breastfeeding practices; and phone owners had 75% lower odds of exclusively breastfeeding (adj. OR 0.25; 95% CI: 0.07-0.92, p = 0.038) in multivariable models. Though not statistically significant but clinically meaningful, cell phone ownership was associated with fewer depressive symptoms (adj. OR 0.84; 95% CI: 0.39-1.84, p = 0.67) and more social support (adj. OR 1.14; 95% CI: 0.61-2.13, p = 0.70). CONCLUSIONS: Digital literacy and internet connectivity are social determinants of health, thus delving deeper into mothers' digital experiences to identify and ameliorate their unique barriers to full digital access will be crucial to successful implementation of digital interventions to address post-partum challenges for women in hard-to-reach settings such as ours. Such interventions are of even greater relevance as the Covid-19 pandemic has increased the urgency of reaching vulnerable, marginalized populations.

Seasonality, Food Insecurity, and Clinical Depression in Post-Partum Women in a Rural Malawi Setting.

OBJECTIVES: We evaluate the association between food insecurity (FI) and clinical depression, and the modifying effects of seasonality on this association. METHODS: Food insecurity is assessed from 175 post-partum women in the rural Ntcheu District of central Malawi using the USAID's Household Food Insecurity Access Scale (HFIAS). Clinical depression is measured using a validated Chichewa version of the Self-Reporting Questionnaire (SRQ). Interviews were conducted from October 2016 to June 2017 and spanned 5 months of the dry season (April-November) and the 4 months of rainy season (December-March). RESULTS: After adjusting for age and parity, participants who reported high FI (HFIAS score ≥ 9) had 4.6 (95%CI 1.8-11.4) times the odds of meeting the cut-off for clinical depression (SRQ score ≥ 8). The effect was greater during the dry season (OR 9.9; 95%CI 2.0-48.6), than in the rainy season (OR 2.6; 95%CI 0.8-8.3) though the interaction term was not statistically significant (p = 0.18) CONCLUSIONS FOR PRACTICE: High FI is associated with diagnostic markers of clinical depression.

Peripheral axons of the adult zebrafish maxillary barbel extensively remyelinate during sensory appendage regeneration.

Myelination is a cellular adaptation allowing rapid conduction along axons. We have investigated peripheral axons of the zebrafish maxillary barbel (ZMB), an optically clear sensory appendage. Each barbel carries taste buds, solitary chemosensory cells, and epithelial nerve endings, all of which regenerate after amputation (LeClair and Topczewski [2010] PLoS One 5:e8737). The ZMB contains axons from the facial nerve; however, myelination within the barbel itself has not been established. Transcripts of myelin basic protein (mbp) are expressed in normal and regenerating adult barbels, indicating activity in both maintenance and repair. Myelin was confirmed in situ by using toluidine blue, an anti-MBP antibody, and transmission electron microscopy (TEM). The adult ZMB contains ∼180 small-diameter axons (<2 µm), approximately 60% of which are myelinated. Developmental myelination was observed via whole-mount immunohistochemistry 4-6 weeks postfertilization, showing myelin sheaths lagging behind growing axons. Early-regenerating axons (10 days postsurgery), having no or few myelin layers, were disorganized within a fibroblast-rich collagenous scar. Twenty-eight days postsurgery, barbel axons had grown out several millimeters and were organized with compact myelin sheaths. Fiber types and axon areas were similar between normal and regenerated tissue; within 4 weeks, regenerating axons restored ∼85% of normal myelin thickness. Regenerating barbels express multiple promyelinating transcription factors (sox10, oct6 = pou3f1; krox20a/b = egr2a/b) typical of Schwann cells. These observations extend our understanding of the zebrafish peripheral nervous system within a little-studied sensory appendage. The accessible ZMB provides a novel context for studying axon regeneration, Schwann cell migration, and remyelination in a model vertebrate.