duration

持续时间
  • 文章类型: Journal Article
    目的:本研究的目的是探讨老年心力衰竭(HF)住院患者物理治疗(PT)的频率和持续时间与住院相关残疾(HAD)发展之间的关系。
    方法:这种单中心,回顾性,观察性研究纳入了接受PT治疗的65岁或以上的HF住院患者.有关人口统计的数据,合并症,实验室发现,药物,康复,并从电子病历中收集日常生活活动(ADLs)状态。根据PT的平均频率和持续时间,患者分为三组:第1组,≥3天/周和≥120分钟/周;第2组,≥3天/周和<120分钟/周;第3组,<3天/周和<120分钟/周.进行Logistic回归分析以确定每周PT的平均频率和持续时间与HAD发生率之间的关联。
    结果:总而言之,105名患者(平均年龄,84.8岁;妇女比例,59%)参加了研究,43例(41.0%)患者出院时出现HAD。在多变量逻辑回归分析中,第2组(赔率比[OR],3.66)和第3组(OR,6.71)使用第1组作为参考,发生HAD的风险显着升高,即使在调整了年龄之后,入院前的ADL,认知功能,HF的严重程度。
    结论:这项研究表明,在老年心力衰竭住院患者中,PT的频率较低和持续时间较短与HAD的发生有关。然而,需要进一步的前瞻性研究来证实这些发现.
    OBJECTIVE: The aim of this study was to examine the relationship between the frequency and duration of physical therapy (PT) and the development of hospitalization-associated disability (HAD) in hospitalized geriatric patients with heart failure (HF).
    METHODS: This single-center, retrospective, observational study included hospitalized patients with HF aged 65 years or older who had received PT. Data regarding demographics, comorbidities, laboratory findings, medications, rehabilitation, and activities of daily living (ADLs) status were collected from electronic medical records. Based on the average frequency and duration of PT, patients were divided into three groups: Group 1, ≥3 days/week and ≥120 minutes/week; Group 2, ≥3 days/week and <120 minutes/week; and Group 3, <3 days/week and <120 minutes/week. Logistic regression analysis was performed to identify the association between the average frequency and duration of weekly PT and the incidence of HAD.
    RESULTS: In all, 105 patients (mean age, 84.8 years; proportion of women, 59%) were enrolled in the study, and 43 (41.0%) patients exhibited HAD at discharge. In the multivariate logistic regression analysis, Group 2 (odds ratio [OR], 3.66) and Group 3 (OR, 6.71) had a significantly elevated risk of developing HAD using Group 1 as the reference, even after adjusting for age, ADLs before admission, cognitive function, and severity of HF.
    CONCLUSIONS: This study showed that a lower frequency and shorter duration of PT are associated with developing HAD in hospitalized geriatric patients with HF. However, further prospective studies are required to confirm these findings.
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  • 文章类型: Journal Article
    由于气候变化和人类干预的影响,全球河流正在变暖。这项研究调查了维斯瓦河流域的河流热浪,欧洲最大的河流系统之一,使用过去30年(1991-2020年)的长期观测的每日河水温度。结果表明,维斯杜拉河流域的河流热浪频率和强度均有所增加。河流热浪总数呈明显上升趋势,平均为1.400次/十年,河流热浪的持续时间平均以14.506天/十年的速度增加,河流热浪的累积强度以平均53.169°C/十年的速率增加。还采用了曼-肯德尔(MK)测试,显示出总数在统计上显着的增长趋势,持续时间,所有河流的热浪强度,包括维斯瓦河及其支流的主要水道,除了少数例外。气温是各水文站河流热浪的主要控制者,随着气温的升高,河流热浪的频率和强度将增加。另一个影响因素是流动,随着流量的增加,河流热浪的数量趋于减少,持续时间和强度。结果表明,应采取缓解措施,以减少气候变化对河流系统的影响。
    Rivers worldwide are warming due to the impact of climate change and human interventions. This study investigated river heatwaves in the Vistula River Basin, one of the largest river systems in Europe using long-term observed daily river water temperatures from the past 30 years (1991-2020). The results showed that river heatwaves are increased in frequency and intensity in the Vistula River Basin. The total number of river heatwaves showed clear increasing trend with an average rate of 1.400 times/decade, the duration of river heatwaves increased at an average rate of 14.506 days/decade, and the cumulative intensity of river heatwaves increased at an average rate of 53.169 °C/decade. The Mann-Kendall (MK) test was also employed, showing statistically significant increasing trends in the total number, duration, and intensity of heatwaves for all rivers, including the main watercourse of the Vistula River and its tributaries, with few exceptions. Air temperature is the major controller of river heatwaves for each hydrological station, and with the increase of air temperatures, river heatwaves will increase in frequency and intensity. Another impacting factor is flow, and with the increase of flow, river heatwaves tend to decrease in number, duration and intensity. The results suggested that mitigation measures shall be taken to reduce the effect of climate change on river systems.
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  • 文章类型: Journal Article
    推荐的血管活性药物在食管静脉曲张破裂出血(EVB)中的持续时间为2-5天。先前对随机试验的荟萃分析仅包括少数比较短与短的研究。长的血管活性药物持续时间接近这个时间范围,包括较旧的管理技术,仅在第5天评估静脉曲张再出血。我们确定了几个额外的随机对照试验(RCT)评估不同持续时间的再出血,随着EVB的更新管理。
    我们进行了最新的系统评价和荟萃分析,评估了血管活性药物持续时间缩短48-72小时的效果。主要结果是5天内再出血。次要结果包括再出血,再出血导致的死亡率,通过血管活性药物和内镜治疗类型的亚组分析,以及4-6周内(延长期)的全因死亡率。逗留时间,输血需求和特利加压素相关不良事件是额外的次要结局.
    我们全面的搜索策略和筛选过程产生了14项随机对照试验,共1060名患者(75.1%为男性):7项试验使用特利加压素,4奥曲肽,和3生长抑素。持续时间缩短加上绑带结扎导致类似的再出血,当排除患有更严重肝病的人群时,出现了减少再出血的趋势。当更短的持续时间联合硬化治疗时,再出血和死亡率更高。更长的持续时间与更长的住院时间有关,对于特利加压素,更多的不良事件。
    在选定的人群中,较短的血管活性药物持续时间与带状结扎相结合似乎是安全的。需要更高功率的RCT,累及不同程度的EVB和肝脏疾病患者。
    UNASSIGNED: The recommended duration of vasoactive drugs in esophageal variceal bleeding (EVB) spans 2-5 days. Prior meta-analyses of randomized trials include only a few studies that compared short vs. long vasoactive drug durations approximating this time range, including older management techniques, and only assessed variceal rebleeding at 5 days. We identified several additional randomized controlled trials (RCTs) assessing rebleeding at various durations, with updated management of EVB.
    UNASSIGNED: We performed an updated systematic review and meta-analysis assessing the effect of shortening the vasoactive drug duration by 48-72 h. The primary outcome was rebleeding within 5 days. Secondary outcomes included rebleeding, mortality due to rebleeding, and all-cause mortality within 4-6 weeks (extended period) with subgroup analysis by vasoactive drug and type of endoscopic therapy. Length of stay, blood transfusion requirements and terlipressin-related adverse events were additional secondary outcomes.
    UNASSIGNED: Our comprehensive search strategy and screening process yielded 14 RCTs with 1060 patients (75.1% male): 7 trials used terlipressin, 4 octreotide, and 3 somatostatin. Shortened durations combined with band ligation led to similar rebleeding, with a trend towards less rebleeding when populations with more severe liver disease were excluded. There was greater rebleeding and mortality over an extended period when shorter durations were combined with sclerotherapy. Longer durations were associated with a longer hospital stay and, for terlipressin, more adverse events.
    UNASSIGNED: Shorter vasoactive drug durations combined with band ligation in selected populations appear safe. Higher powered RCTs are needed, involving patients with different degrees of severity of EVB and liver disease.
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  • 文章类型: Journal Article
    了解第二语言(L2)学习者在词汇语调感知中面临的挑战对于有效的语言习得至关重要。本研究调查了夸张的声学特性对促进英语使用者普通话音调学习的影响。使用合成的音调刺激,我们通过三个关键修改系统地操纵音高轮廓:扩展基频(F0),增加F0(女性声音),并延长整体持续时间。我们的目标是评估F0扩张的影响,F0越高,持续时间越长,以及不同音节对普通话声调学习和概括的影响。参与者从事非适应性逐个试验的语气识别任务。混合效应逻辑回归模型用于分析各学习阶段的准确性,声学因素,和音调。研究结果表明,从训练到测试和概括阶段,准确性得到了提高,表明感知训练对成人英语使用者的语调感知的有效性。音调1是最容易感知的,而音调3构成了最大的挑战,与已建立的音调获取难度等级一致。声学因素分析突出了音调特定的影响。扩大的F0有利于音调2和音调3的鉴定,但对音调1和音调4提出了挑战。此外,更长的持续时间也表现出不同的效果,帮助识别音调3和音调4,但阻碍音调1识别。较高的F0对音调2有利,但对音调3不利。此外,音节ma促进了音调1和音调2的识别,但不适用于音调3和音调4。这些发现增强了我们对声学特性在L2音调感知中的作用的理解,并对设计有效的第二语言习得训练计划具有意义。
    Understanding the challenges faced by second language (L2) learners in lexical tone perception is crucial for effective language acquisition. This study investigates the impact of exaggerated acoustic properties on facilitating Mandarin tone learning for English speakers. Using synthesized tone stimuli, we systematically manipulated pitch contours through three key modifications: expanding the fundamental frequency (F0), increasing F0 (female voice), and extending the overall duration. Our objectives were to assess the influence of F0 expansion, higher F0, longer duration, and varied syllables on Mandarin tone learning and generalization. Participants engaged in a non-adaptive trial-by-trial tone identification task. Mixed-effects logistic regression modeling was used to analyze accuracy across learning phases, acoustic factors, and tones. Findings reveal improvements in accuracy from training to testing and generalization phases, indicating the effectiveness of perceptual training to tone perception for adult English speakers. Tone 1 emerged as the easiest to perceive, while Tone 3 posed the most challenge, consistent with established hierarchies of tonal acquisition difficulty. Analysis of acoustic factors highlighted tone-specific effects. Expanded F0 was beneficial for the identification of Tone 2 and Tone 3 but posed challenges for Tone 1 and Tone 4. Additionally, longer durations also exhibited varied effects across tones, aiding in the identification of Tone 3 and Tone 4 but hindering Tone 1 identification. The higher F0 was advantageous for Tone 2 but disadvantageous for Tone 3. Furthermore, the syllable ma facilitated the identification of Tone 1 and Tone 2 but not for Tone 3 and Tone 4. These findings enhance our understanding of the role of acoustic properties in L2 tone perception and have implications for the design of effective training programs for second language acquisition.
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  • 文章类型: Editorial
    暂无摘要。
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  • 文章类型: Journal Article
    先前的研究表明,从宫颈成熟球囊放置到分娩的时间较短,总球囊放置时间较短,但排除了先前剖宫产的患者。
    要评估,在有剖宫产史的患者中,使用双球囊导管进行宫颈成熟,计划在6小时和12小时后移除装置是否会导致更短的阴道分娩时间。
    在2020年11月发生实践变化后进行了前后研究,将双气囊导管放置宫颈成熟的计划时间从12小时缩短至6小时。通过回顾性电子图表审查收集数据。主要结果是从球囊放置到阴道分娩的时间。次要结果包括剖宫产率,产妇羊膜腔内感染,还有子宫破裂.Kaplan-Meier曲线比较了两组之间的中位分娩时间。Cox比例风险模型用于调整球囊放置时间,以前阴道分娩的次数,和共同使用的药物。
    从2018年11月至2022年11月,189名有剖宫产史的可分析患者在分娩试验期间接受了双球囊导管促宫颈成熟。将患者分为政策变更前和政策变更后的组(分别为91和98)。前组阴道分娩的中位时间为28小时(95%CI:26,35),后组为25小时(95%CI:23,29)(P值0.052)。在球囊放置时调整扩张后,以前阴道分娩的次数,和共同用药,政策变更后阴道分娩成功的估计风险比为1.89(95%CI:1.27,2.81).次要结局率没有差异。
    在先前剖腹产的患者中,使用双气囊导管进行机械性宫颈成熟,与12小时相比,计划在6小时切除可能会导致更高的成功阴道分娩的机会和更短的分娩时间,不增加剖宫产和羊膜腔内感染的发生率。
    UNASSIGNED: Previous studies that suggest a shorter time from cervical ripening balloon placement to delivery with shorter total balloon placement time have excluded patients with prior cesarean deliveries.
    UNASSIGNED: To evaluate, in patients with a prior history of cesarean delivery undergoing cervical ripening with a double-balloon catheter, whether planned removal of device after 6 vs 12 hours would result in shorter time to vaginal delivery.
    UNASSIGNED: A before-and-after study was performed after a practice change occurred November 2020, shortening the planned time of double-balloon catheter placement for cervical ripening from 12 to 6 hours. Data were collected via retrospective electronic chart review. Primary outcome was time from balloon placement to vaginal delivery. Secondary outcomes included rates of cesarean delivery, maternal intraamniotic infection, and uterine rupture. Kaplan-Meier curves compared median times to delivery between the groups. A Cox proportional-hazards model was used to adjust for time of balloon placement, number of previous vaginal deliveries, and co-medications used.
    UNASSIGNED: From November 2018 to November 2022, 189 analyzable patients with a prior history of cesarean delivery received a double-balloon catheter for cervical ripening during their trial of labor. Patients were separated into pre- and postpolicy change groups (n=91 and 98, respectively). The median time to vaginal delivery for the pregroup was 28 hours (95% CI: 26, 35) and 25 hours (95% CI: 23, 29) for those in the postgroup (P value .052). After adjusting for dilation at time of balloon placement, number of previous vaginal deliveries, and co-medication, the estimated hazard ratio for successful vaginal delivery postpolicy change was 1.89 (95% CI: 1.27, 2.81). There were no differences in rates of secondary outcomes.
    UNASSIGNED: In patients with prior cesarean delivery undergoing mechanical cervical ripening with a double-balloon catheter, planned removal at 6 hours compared to 12 hours may result in higher chances of successful vaginal delivery and possibly a shorter time to delivery, without increasing rates of cesarean delivery and intraamniotic infection.
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  • 文章类型: Journal Article
    这封信讨论了冯等人的出版物。碘,硒,和维生素D与人类甲状腺激素的产生密切相关;然而,补充硒和维生素D对2型糖尿病(T2DM)合并桥本甲状腺炎(HT)患者的疗效仍存在争议.在我们在这里讨论的回顾性研究中,作者强调了甲状腺功能的显著改善,甲状腺抗体,血糖,在抗糖尿病方案中添加维生素D和硒后,T2DM伴HT患者的血脂和血脂,强调这些补充剂的价值。我们的团队目前正在研究探索微量营养素与HT之间的关系,我们从上述研究中获得了宝贵的见解。基于本研究和现有文献,对于HT患者,我们建议使用4000IU/天的维生素D和100-200μg/天的硒治疗方案超过3个月至6个月,特别是对于那些并发T2DM。
    This letter discusses the publication by Feng et al. Iodine, selenium, and vitamin D are closely associated with thyroid hormone production in humans; however, the efficacy of selenium and vitamin D supplementation for type 2 diabetes mellitus (T2DM) patients with Hashimoto\'s thyroiditis (HT) remains controversial. In the retrospective study we discuss herein, the authors highlighted significant improvements in thyroid function, thyroid antibodies, blood glucose, and blood lipid in T2DM patients with HT following addition of vitamin D and selenium to their antidiabetic regimens, underscoring the value of these supplements. Our team is currently engaged in research exploring the relationship between micronutrients and HT, and we have obtained invaluable insights from the aforementioned study. Based on this research and current literature, we recommend a regimen of 4000 IU/day of vitamin D and 100-200 μg/day of selenium for over three months to six months for patients with HT, particularly for those with concurrent T2DM.
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  • 文章类型: Journal Article
    由于气道阻塞和发育中的大脑,颅面畸形儿童的气管造口术拔管带来了挑战。这项研究旨在根据气管造口术的年龄和插管的持续时间比较拔管结果,以确定长期气管造口术儿童拔管的最佳时间。
    这项回顾性研究包括12名儿童,他们在单中心接受了长期气管造口术治疗颅面畸形的拔管。人口统计数据,临床特征,收集拔管过程和结果。将儿童分为两组:气管造口术时≤6岁(n=7)和>6岁(n=5)。
    所有儿童均成功拔管,无立即并发症。对1例轻度气管软化和1例声门下狭窄进行了拔管前治疗。与>6岁组相比,≤6岁的儿童在吞咽和说话方面表现出更好的术后适应性。值得注意的是,≤6年组早期和长期气管造口术与拔管后更容易适应相关.社交互动是另一个挑战,特别是对于>6岁组。
    气管造口术的时间和持续时间显著影响拔管后适应,可能是由于神经可塑性等因素,肌肉记忆和心理调节。这强调了全面护理的必要性,特别是对于年龄较大的孩子。儿童早期气管造口术可以使他们适应言语和吞咽技巧,缓解拔管后技能的重获。相反,具有完全发展技能的年龄较大的儿童在气管切开和拔管后可能很难重新学习它们。气管造口术的年龄和插管的持续时间会影响颅面畸形儿童的拔管结果。进一步的研究对于制定有针对性的干预措施以改善术后护理至关重要,特别是对于年龄较大的孩子。
    UNASSIGNED: Tracheostomy decannulation in children with craniofacial deformities poses challenges due to airway obstruction and the developing brain. This study aimed to compare decannulation outcomes based on age at tracheostomy and duration of cannulation so as to identify the best time for decannulation for children with long-term tracheostomy.
    UNASSIGNED: This retrospective study included 12 children at a single centre who underwent decannulation after prolonged tracheostomy for craniofacial deformities. Data on demographics, clinical features, decannulation process and outcomes were collected. Children were divided into two groups: ≤6 years (n = 7) and >6 years (n = 5) at tracheostomy insertion.
    UNASSIGNED: All children underwent successful decannulation without immediate complications. One case of mild tracheomalacia and one of subglottic stenosis were treated pre-decannulation. Children ≤6 years demonstrated better post-operative adaptation in swallowing and speaking compared to the >6 years group. Notably, early and prolonged tracheostomy in the ≤6 years group was associated with easier adaptation post-decannulation. Social interaction was another challenge, particularly for the >6 years group.
    UNASSIGNED: The timing and duration of tracheostomy significantly impacts post-decannulation adaptation, likely due to factors such as neuroplasticity, muscle memory and psychological adjustment. This emphasises the need for comprehensive care, especially for older children. Early tracheostomy in children may allow them to adapt speech and swallowing skills, easing post-decannulation regain of skills. Conversely, older children with fully developed skills may struggle to relearn them after tracheostomy and decannulation. Age at tracheostomy and duration of cannulation influences decannulation outcomes in children with craniofacial deformities. Further research is crucial to develop targeted interventions for better post-operative care, particularly for older children.
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  • 文章类型: Journal Article
    背景:氟喹诺酮类药物是最常用的抗生素。由于它们已知的驱动抗菌素耐药性的趋势,他们的处方模式需要更多的限制。本研究旨在描述氟喹诺酮类药物处方的临床实践,肾损害患者的剂量调整和细菌耐药性,最终提供循证建议,以优化当地人群的抗生素处方.
    方法:本回顾性研究,横断面研究在巴勒斯坦的An-Najah国立大学医院进行.数据收集自2021年7月至2023年6月接受环丙沙星或左氧氟沙星的住院患者。检查了来自各个医院部门的692名住院患者的数据(左氧氟沙星为409名,环丙沙星为283名)。统计分析是通过IBMSPSS23.0版进行的,以总结人口统计,临床,和流行病学数据。
    结果:社会人口统计学特征显示出不同的年龄分布,环丙沙星和左氧氟沙星的年龄在50岁以上的比例为25.4%和39%,分别。环丙沙星主要用于肿瘤科(28.2%),手术预防(22.6%)和发热或无发热性中性粒细胞减少(21.1%)是最常见的适应症。左氧氟沙星主要用于内科病房(45.7%),主要用于下呼吸道感染(58.8%)和预防骨髓移植(16.5%)。肠球菌和耐甲氧西林金黄色葡萄球菌是最常见的病原菌,62.5%的分离株对环丙沙星有耐药性。此外,产超广谱β-内酰胺酶的肠杆菌是最常见的病原菌,33.3%对左氧氟沙星耐药。统计分析显示,抗生素的选择与治疗方法之间存在显着关联。左氧氟沙星比环丙沙星更有可能用作经验性治疗(p<0.001)。而环丙沙星更可能用作靶向治疗(p<0.001)。
    结论:本研究调查了发展中国家一家大型医院的处方实践和对左氧氟沙星和环丙沙星的耐药性。根据细菌的耐药性,我们得出的结论是,医院部门需要对这些抗生素的使用施加更大的限制。为此,应开展针对氟喹诺酮类药物与现行治疗指南的临床疗效的进一步研究,以评估其适当性.
    BACKGROUND: Fluoroquinolones are the most commonly prescribed antibiotics. Because of their known tendency to drive antimicrobial resistance, their prescribing patterns need to be more restricted. This study aimed to describe the clinical practice of fluoroquinolone prescription, dose adjustments for renal impairment patients and bacterial resistance profiles, eventually providing evidence-based recommendations to optimize antibiotic prescribing practices in the local population.
    METHODS: This retrospective, cross-sectional study was conducted at An-Najah National University Hospital in Palestine. The data were collected from admitted patients who were given ciprofloxacin or levofloxacin from July 2021 to June 2023. Data from 692 inpatients across various hospital departments were examined (409 for levofloxacin and 283 for ciprofloxacin). Statistical analysis was performed via IBM SPSS version 23.0 to summarize the demographic, clinical, and epidemiological data.
    RESULTS: The sociodemographic profile revealed diverse age distributions, with 25.4% and 39% older than 50 years for ciprofloxacin and levofloxacin, respectively. Ciprofloxacin was predominantly used in the oncology department (28.2%), with surgical prophylaxis (22.6%) and febrile or afebrile neutropenia (21.1%) being the most common indications. Levofloxacin was predominantly used in the medical ward (45.7%), mainly for lower respiratory tract infection (58.8%) and prophylaxis for bone marrow transplantation (16.5%). Enterococcus and methicillin-resistant Staphylococcus aureus were the most commonly isolated pathogens, with 62.5% of the isolates demonstrating resistance to ciprofloxacin. Moreover, extended-spectrum beta-lactamase-producing Enterobacterales were the most common pathogen isolated, with 33.3% being resistant to levofloxacin. Statistical analysis revealed a significant association between the choice of antibiotic and the approach to therapy. Levofloxacin was significantly more likely than ciprofloxacin to be used as empiric therapy (p < 0.001), whereas ciprofloxacin was more likely to be used as targeted therapy (p < 0.001).
    CONCLUSIONS: This study investigated prescribing practices and resistance to levofloxacin and ciprofloxacin in a large hospital in a developing country. According to the bacterial resistance profiles, we conclude that there is a need for hospital departments to exercise greater restraint on the use of these antibiotics. To this end, further studies addressing the clinical efficacy of fluoroquinolones against the current treatment guidelines to evaluate their appropriateness should be carried out.
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  • 文章类型: Journal Article
    尽管在精神分裂症患者中一直发现受损的听觉失配负性(MMN),关于分裂型非临床个体的报道很少且不一致.迄今为止,没有研究在非临床分裂型样本中全面评估MMN与不同程度的异常球.这项研究的目的是检查具有高分裂型特征的非临床参与者在两种异常持续时间条件(大和小)下持续时间MMN(dMMN)幅度的程度。
    采用了极端群体设计,其中,使用分裂型人格问卷(SPQ),从1519名年轻成人中选择分裂型和对照组的63名参与者.使用被动持续时间奇数球范例测量MMN。基本的人口统计信息和音乐背景进行了评估和匹配,同时对抑郁和焦虑进行了评估和控制。利用协方差的重复测量分析来评估组间dMMN的差异。Bonferroni校正应用于多重比较。进行偏相关和多元线性回归分析以研究dMMN振幅与SPQ评分之间的关联。
    在非临床分裂型个体中,在大偏差条件下,Cz处dMMN的振幅显着增加(F=4.36,p=.04)。在对照组中,Fz处的大偏差dMMN振幅与轻度认知知觉症状呈正相关(rp=.42,p=.03)。然而,随着精神分裂症样症状恶化并接近精神分裂症的临床阈值,在分裂型组中,Cz处的小偏差dMMN振幅与认知知觉因子呈负相关(rp=-.40,p=.04).
    这些结果表明,在具有分裂型特征的非临床参与者中实施听觉怪球范式时,考虑持续时间偏差程度的重要性。此外,我们的发现揭示了自下而上的听觉处理与精神分裂症频谱的正维度之间潜在的非线性关系.
    UNASSIGNED: Although impaired auditory mismatch negativity (MMN) has consistently been found in individuals with schizophrenia, there are few and inconsistent reports on nonclinical individuals with schizotypy. To date, no studies have thoroughly assessed MMN with different degrees of deviant oddballs in nonclinical schizotypal samples. The aim of this study was to examine the extent of duration MMN (dMMN) amplitudes under two deviant duration conditions (large and small) in nonclinical participants with high schizotypal traits.
    UNASSIGNED: An extreme-group design was utilized, in which 63 participants from the schizotypy and control groups were selected from a pool of 1519 young adults using the Schizotypal Personality Questionnaire (SPQ). MMN was measured using passive duration oddball paradigms. Basic demographic information and musical backgrounds were assessed and matched, while depression and anxiety were evaluated and controlled for. The repeated measures analysis of covariance was utilized to evaluate differences in dMMN between groups. The Bonferroni correction was applied for multiple comparisons. Partial correlation and multiple linear regression analyses were conducted to investigate the association between dMMN amplitudes and SPQ scores.
    UNASSIGNED: The amplitudes of dMMN at Cz were significantly increased under the large deviance condition in nonclinical schizotypal individuals (F = 4.36, p = .04). Large-deviance dMMN amplitudes at Fz were positively correlated with mild cognitive-perceptual symptoms in the control group (rp = .42, p = .03). However, as schizophrenia-like symptoms worsened and approached the clinical threshold for schizophrenia, small-deviance dMMN amplitudes at Cz showed negative associations with the cognitive-perceptual factor in the schizotypy group (rp = -.40, p = .04).
    UNASSIGNED: These results suggest the importance of considering the degree of deviation in duration when implementing the auditory oddball paradigm among nonclinical participants with schizotypal traits. In addition, our findings reveal a potential non-linear relationship between bottom-up auditory processing and the positive dimension of the schizophrenia spectrum.
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