Browsing by Subject "Cross-sectional study"

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    Association between plasma L-carnitine levels and mitochondrial DNA copy number
    (Springer Nature, 2023-12-11) Li, Mingyue; Yang, Keming; De Vivo, Immaculata; Eliassen, A. Heather; Qureshi, Abrar A.; Nan, Hongmei; Han, Jiali; Epidemiology, Richard M. Fairbanks School of Public Health
    Mitochondria are key cytoplasmic organelles in eukaryotic cells that generate adenosine triphosphate (ATP) through the electron transport chain and oxidative phosphorylation. Mitochondrial DNA (mtDNA) copy number (mtDNAcn) is considered a biomarker for both mitochondrial quantity and function as well as cellular oxidative stress level. Previous epidemiologic findings revealed that weight gain, higher body mass index (BMI), smoking, and high insulinemic potential of lifestyle were associated with lower leukocyte mtDNAcn. Carnitines are a group of compounds that play a critical role in energy production. We quantified the associations of plasma L-carnitine levels with leukocyte mtDNAcn. We then examined the association between mtDNAcn and L-carnitine (HMDB0000062) in 538 U.S. men without cancers, diabetes, or cardiovascular disease at blood collection from the Health Professionals Follow-Up Study (HPFS). We found a significant inverse association between L-carnitine and mtDNAcn (ρ = −0.1, P = 0.02). This implies that the carnitine metabolic pathway may be associated with mitochondrial function and oxidative stress.
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    Decreasing trend of gastroschisis prevalence in the United States from 2014 through 2022: Is attributed to declining birth rates in young, high-risk gravidae
    (Elsevier, 2025-02-12) Mustafa, Hiba J.; Zargarzadeh, Nikan; Moss, Kevin L.; Abiad, May; Gray, Brian; Aagaard, Kjersti M.; Buchmiller, Terry L.; Perrone, Erin E.; Shamshirsaz, Alireza A.; Biostatistics and Health Data Science, Richard M. Fairbanks School of Public Health
    Objectives: To investigate the prevalence trend of gastroschisis in the United States between 2014 and 2022. Methods: A cross-sectional retrospective analysis of the Centers for the United States live births between 2014 and 2022. Pregnancies and neonatal singleton live births with documented isolated gastroschisis were included. Neonates with other major congenital anomalies and known chromosomal abnormalities were excluded. Prevalence per 10,000 live births along with 95 % confidence intervals was estimated. Results: Among 32,088,301 singleton live births, 6804 cases of isolated gastroschisis were identified (Point prevalence: 2 in 10,000 live births). A significant decline in gastroschisis prevalence was observed, decreasing from 2.86 per 10,000 live births in 2014-1.55 per 10,000 live births in 2022 (P < 0.001). The risk of gastroschisis was significantly higher in teen and nulliparous gravidae, with prepregnancy tobacco use, and among socially vulnerable populations (underweight, < 12th-grade education, Medicaid, non-Hispanic Indigenous Americans). The drop in gastroschisis births from 2014 to 2022, compared to non-gastroschisis births, is more significant in maternal age < 20 years, nulliparous, BMI < 18.5, and in smokers prior to pregnancy than in the overall population (P = 0.02, 0.0008, <0.0001, <0.0001, and 0.01 respectively). All of the associated maternal factors had a significant decline in prevalence (P < 0.001), which may influence the decreasing trend of gastroschisis. There was no perceived considerable impact of the COVID-19 pandemic on gastroschisis trends. Conclusions: The study highlights a notable decline in gastroschisis prevalence mostly attributable to a declining birth rate in the highest at-risk strata, suggesting recent increases in birth rates among these at-risk gravidae may reverse the trend of declining gastroschisis disease prevalence. These findings support the need for ongoing further research to understand effective means of sustaining this decreasing trend.
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    Distal and Proximal Influences on Self-Reported Oral Pain and Self-Rated Oral Health Status in Saudi Arabia: Retrospective Study Using a 2017 Nationwide Database
    (JMIR, 2024-12-20) Abogazalah, Naif; Yiannoutsos, Constantin; Soto-Rojas, Armando E.; Bindayeld, Naif; Yepes, Juan F.; Martinez Mier, Esperanza Angeles; Biostatistics and Health Data Science, Richard M. Fairbanks School of Public Health
    Background: Oral health significantly influences overall well-being, health care costs, and quality of life. In Saudi Arabia, the burden of oral diseases, such as dental caries and periodontal disease, has increased over recent decades, driven by various lifestyle changes. Objective: To explore the associations between proximal (direct) and distal (indirect) influences that affect oral pain (OP) and self-rated oral health (SROH) status in the Kingdom of Saudi Arabia (KSA) using an adapted conceptual framework. Methods: This retrospective cross-sectional study used data from a national health survey conducted in KSA in 2017. The sample included adults (N=29,274), adolescents (N=9910), and children (N=11,653). Sociodemographic data, health characteristics, and access to oral health services were considered distal influences, while frequency and type of dental visits, tooth brushing frequency, smoking, and consumption of sweets and soft drinks were considered proximal influences. Path analysis modeling was used to estimate the direct, indirect, and total effects of proximal and distal influences on OP and SROH status. Results: The mean age of adult respondents was 42.2 years; adolescents, 20.4 years; and children, 10.58 years. Despite OP reports from 39% of children, 48.5% of adolescents, and 47.1% of adults, over 87% across all groups rated their oral health as good, very good, or excellent. A higher frequency of tooth brushing showed a strong inverse relationship with OP and a positive correlation with SROH (P<.001). Frequent dental visits were positively associated with OP and negatively with SROH (P<.001). Sweet consumption increased OP in adolescents (β=0.033, P=.007) and negatively affected SROH in children (β=-0.086, P<.001), adolescents (β=-0.079, P<.001), and adults (β=-0.068, P<.001). Soft drink consumption, however, was associated with lower OP in adolescents (β=-0.034, P=.005) and improved SROH in adolescents (β=0.063, P<.001) and adults (β=0.068, P<.001). Smoking increased OP in adults (β=0.030, P<.001). Distal influences like higher education were directly linked to better SROH (β=0.046, P=.003) and less OP (indirectly through tooth brushing, β=-0.004, P<.001). For children, high household income correlated with less OP (β=-0.030, P=.02), but indirectly increased OP through other pathways (β=0.024, P=.003). Lack of access was associated with negative oral health measures (P<.001). Conclusions: Among the KSA population, OP and SROH were directly influenced by many proximal and distal influences that had direct, indirect, or combined influences on OP and SROH status.
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    Insulinemic Potential of Lifestyle Is Inversely Associated with Leukocyte Mitochondrial DNA Copy Number in US White Adults
    (Elsevier, 2020-08-01) Yang, Keming; Forman, Michele R.; Monahan, Patrick O.; Graham, Brett H.; Chan, Andrew T.; Zhang, Xuehong; De Vivo, Immaculata; Giovannucci, Edward L.; Tabung, Fred K.; Nan, Hongmei; Epidemiology, School of Public Health
    Background: Poor lifestyles have been linked to insulin insensitivity/hyperinsulinemia, which may contribute to downstream changes such as inflammation and oxidative damage and the development of chronic diseases. As a biomarker of intracellular oxidative stress, leukocyte mitochondrial DNA copy number (mtDNA-CN) has been related to lifestyle factors including diet and weight. No epidemiologic study has examined the relation between combined insulinemic potential of lifestyle and mtDNA-CN. Objectives: Our aim was to examine the association between Empirical Lifestyle Index for Hyperinsulinemia (ELIH) and leukocyte mtDNA-CN in US men and women. Methods: This cross-sectional analysis included 2835 white adults without cancers, diabetes, or cardiovascular disease at blood collection, including 2160 women from the Nurses' Health Study and 675 men from the Health Professionals Follow-Up Study. ELIH is an index based on plasma C-peptide that characterizes the insulinemic potential of lifestyle (diet, body weight, and physical activity). Relative mtDNA-CN in peripheral blood leukocytes was measured by qPCR-based assay. Results: We found a significant inverse association between ELIH and mtDNA-CN. In multivariable-adjusted linear models, absolute least squares means ± SDs of mtDNA-CN z score across ELIH quintiles in women were as follows: Q1: 0.14 ± 0.05; Q2: 0.04 ± 0.06; Q3: 0.008 ± 0.05; Q4: 0.01 ± 0.05; and Q5: -0.06 ± 0.05 (P-trend = 0.006). Means ± SDs in men were as follows: Q1: 0.25 ± 0.09; Q2: 0.23 ± 0.09; Q3: 0.07 ± 0.09; Q4: 0.02 ± 0.09; and Q5: -0.04 ± 0.09 (P-trend = 0.007). Means ± SDs in all participants were as follows: Q1: 0.16 ± 0.05; Q2: 0.07 ± 0.05; Q3: 0.01 ± 0.05; Q4: 0.01 ± 0.05; and Q5: -0.05 ± 0.05 (P-trend = 0.0004). Conclusions: Hyperinsulinemic lifestyles (i.e., higher ELIH) were associated with lower leukocyte mtDNA-CN among subjects without major diseases, suggesting that the difference in lifestyle insulinemic potential may be related to excessive oxidative stress damage.
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    The prevalence and density of asymptomatic Plasmodium falciparum infections among children and adults in three communities of western Kenya
    (BMC, 2021-09-17) Salgado, Christina; Ayodo, George; Macklin, Michael D.; Gould, Meetha P.; Nallandhighal, Srinivas; Odhiambo, Eliud O.; Obala, Andrew; Prudhomme O’Meara, Wendy; John, Chandy C.; Tran, Tuan M.; Medicine, School of Medicine
    Background: Further reductions in malaria incidence as more countries approach malaria elimination require the identification and treatment of asymptomatic individuals who carry mosquito-infective Plasmodium gametocytes that are responsible for furthering malaria transmission. Assessing the relationship between total parasitaemia and gametocytaemia in field surveys can provide insight as to whether detection of low-density, asymptomatic Plasmodium falciparum infections with sensitive molecular methods can adequately detect the majority of infected individuals who are potentially capable of onward transmission. Methods: In a cross-sectional survey of 1354 healthy children and adults in three communities in western Kenya across a gradient of malaria transmission (Ajigo, Webuye, and Kapsisywa-Kipsamoite), asymptomatic P. falciparum infections were screened by rapid diagnostic tests, blood smear, and quantitative PCR of dried blood spots targeting the varATS gene in genomic DNA. A multiplex quantitative reverse-transcriptase PCR assay targeting female and male gametocyte genes (pfs25, pfs230p), a gene with a transcriptional pattern restricted to asexual blood stages (piesp2), and human GAPDH was also developed to determine total parasite and gametocyte densities among parasitaemic individuals. Results: The prevalence of varATS-detectable asymptomatic infections was greatest in Ajigo (42%), followed by Webuye (10%). Only two infections were detected in Kapsisywa. No infections were detected in Kipsamoite. Across all communities, children aged 11-15 years account for the greatest proportion total and sub-microscopic asymptomatic infections. In younger age groups, the majority of infections were detectable by microscopy, while 68% of asymptomatically infected adults (> 21 years old) had sub-microscopic parasitaemia. Piesp2-derived parasite densities correlated poorly with microscopy-determined parasite densities in patent infections relative to varATS-based detection. In general, both male and female gametocytaemia increased with increasing varATS-derived total parasitaemia. A substantial proportion (41.7%) of individuals with potential for onward transmission had qPCR-estimated parasite densities below the limit of microscopic detection, but above the detectable limit of varATS qPCR. Conclusions: This assessment of parasitaemia and gametocytaemia in three communities with different transmission intensities revealed evidence of a substantial sub-patent infectious reservoir among asymptomatic carriers of P. falciparum. Experimental studies are needed to definitively determine whether the low-density infections in communities such as Ajigo and Webuye contribute significantly to malaria transmission.