A review and meta-analysis: Cross-tissue telomere length correlations in healthy humans.

BACKGROUND AND AIM: Tissue source has been shown to exert a significant effect on the magnitude of associations between telomere length and various health outcomes and exposures. The purpose of the present qualitative review and meta-analysis is to describe and investigate the impact of study design and methodological features on the correlation between telomere lengths measured in different tissues from the same healthy individual. METHODS: This meta-analysis included studies published from 1988 to 2022. Databases searched included PubMed, Embase, and Web of Science and studies were identified using the keywords "telomere length" and "tissues" or "tissue." A total of 220 articles of 7856 initially identified studies met inclusion criteria for qualitative review, of which 55 met inclusion criteria for meta-analysis in R RESULTS: Studies meeting inclusion criteria for meta-analysis tended to have enhanced demographic and methodological reporting relative to studies only included in the qualitative review. A total of 463 pairwise correlations reported for 4324 unique individuals and 102 distinct tissues were extracted from the 55 studies and subject to meta-analysis, resulting in a significant effect size z = 0.66 (p < 0.0001) and meta-correlation coefficient of r = 0.58. Meta-correlations were significantly moderated by sample size and telomere length measurement methodology, with studies of smaller size and those using hybridization-based analyses exhibiting the largest meta-correlation. Tissue source also significantly moderated the meta-correlation, wherein correlations between samples of a different lineage (e.g., blood vs. non-blood) or collection method (e.g., peripheral vs. surgical) were lower than correlations between samples of the same lineage or collection method. CONCLUSION: These results suggest that telomere lengths measured within individuals are generally correlated, but future research should be intentional in selecting a tissue for telomere length measurement that is most biologically relevant to the exposure or outcome investigated and balance this with the feasibility of obtaining the sample in sufficient numbers of individuals.

Yoga and Mindfulness Interventions for Preschool-Aged Children in Educational Settings: A Systematic Review.

Early childhood and the pre-school stage of development constitute a dynamic period for acquisition of social-emotional competencies. Yoga and mindfulness practices (YMP) have become increasingly used in schools for social emotional learning, but less is known about their utility in early childhood settings. A systematic review using PRISMA guidelines was undertaken to explore the effect of YMP on social emotional function among preschool-aged children (3-5 years). The review resulted in identification of 1115 records, of which 80 full text articles were screened, with final inclusion of 16 studies. Included studies evaluated the effect of YMP on social-emotional functioning, and identified the potential for YMP to improve regulatory skills such as behavioral self-regulation and executive function. Among studies reviewed, 13 reported improvements in these domains, but quality appraisal indicated significant variability in risk of bias across studies, and heterogeneity of outcome measurements hindered comparison. Programs appeared to produce better results when implemented for at least 6 weeks and among children who had lower baseline social-emotional functioning. YMP constitute a promising strategy for social emotional development in early childhood settings, but additional rigorously designed studies are needed to expand understanding of how and why these programs are effective.

Parent and family perspectives on home-based newborn care practices in lower-income countries: a systematic review of qualitative studies.

OBJECTIVES: To understand family and parent perspectives on newborn care provided at home to infants in the first 28 days of life, in order to inform behavioural interventions for improving care in low-income countries, where the majority of newborn deaths occur. DESIGN: A comprehensive, qualitative systematic review was conducted. MEDLINE/PubMed, Embase and Cumulative Index of Nursing and Allied Health databases were systematically searched for studies examining the views of parents and family members on newborn care at home. The search period included all studies published from 2006 to 2017. Studies using qualitative approaches or mixed-methods studies with substantial use of qualitative techniques in both the methods and analysis sections were included. Studies meeting the inclusion criteria were extracted and evaluated using Critical Appraisal Skills Programme guidelines. Following the initial selection and appraisal, barriers and facilitators to recommended care practices across several domains were synthesised. RESULTS: Of 411 results retrieved, 37 met both inclusion and quality appraisal criteria for methodology and reporting. Geographical representation largely reflected that of newborn health outcomes globally, with the majority of studies conducted in the region of Sub-Saharan Africa and South Asia. Specific barriers and facilitators were identified among a range of domains including: cord care, drying and wrapping, thermal control, skin to skin contact, hygiene, breast feeding, care-seeking for illness, and low birthweight recognition. Cross cutting facilitators, common to all domains were evident and includeddelivery at a health facility, inclusion of female relatives in care counselling, lower healthcare costs, and exposure to newborn care behaviour change messaging in the community. CONCLUSIONS: When designing behavioural interventions to address newborn mortality at scale, policy-makers and practitioners must include barriers and facilitators important to families in low-income settings. PROSPERO REGISTRATION NUMBER: CRD42016035674.