目的 探讨重复经颅磁刺激应用于帕金森病失眠患者中的效果及对睡眠质量的影响。方法 选取2021年1月—2022年3月南阳南石医院神经内科收治的帕金森病失眠患者100例,按照随机数字表法均分为参照组（n=50）和研究组（n=50）,参照组采用常规西药治疗,研究组在参照组基础上采用重复经颅磁刺激治疗,对比两组治疗效果、神经递质指标水平、帕金森症状表现及睡眠质量评分的差异。结果 研究组治疗总有效率98.00%（49/50）高于参照组82.00%（41/50）,对比差异有统计学意义（P<0.05）。治疗后,研究组神经递质多巴胺及5-羟色胺水平分别为（6.84±0.62）、（22.75±0.59）,均高于参照组,对比差异均有统计学意义（P<0.05）。治疗后,研究组帕金森病症状表现及睡眠质量总评分均低于参照组,对比差异均有统计学意义（P<0.05）。结论 重复经颅磁刺激应用到帕金森病失眠患者的治疗中,能提升疗效,明显改善患者睡眠质量和帕金森病症状。

Objective To investigate the effect of repetitive transcranial magnetic stimulation（rTMS）on Parkinson's insomnia and its influence on sleep quality．Methods A total of 100 Parkinson's patients with insomnia admitted to the Department of Neurology,Nanyang Nanshi Hospital from January 2021 to March 2022 were selected and divided into the reference group（n=50）and the study group（n=50）according to random number table method．The reference group was treated with conventional western medicine,and the study group was treated with rTMS on the basis of the reference group．The levels of neurotransmitters,symptoms of Parkinson's disease and sleep quality were compared．Results The effective rate of the study group was 98.00%（49/50）,which was higher than 82.00%（41/50）of the reference group,with statistical significance（P<0.05）．After treatment,the levels of dopamine and 5-hydroxytryptamine in the study group,（6.84±0.62）and（22.75±0.59）,were higher than those in the reference group,and the comparison was statistically significant（P<0.05）．After treatment,the total score of Parkinson's symptom and sleep quality in the study group were lower than those in the reference group,with statistical significance（P<0.05）．Conclusions The application of rTMS in the treatment of Parkinson's patients with insomnia can improve the curative effect,significantly improve the sleep quality and symptoms of Parkinson's disease,and is worthy of further application and promotion．

目的 探讨氟哌噻吨美利曲辛联合帕罗西汀对重度抑郁障碍（MDD）患者躯体化症状、睡眠和认知功能的影响分析以及临床应用效果。方法 回顾性分析2020年8月—2023年2月在南昌市某医院接受治疗的120例MDD患者相关资料,按照其治疗方案不同分为帕罗西汀治疗组（常规组,n=55）和氟哌噻吨美利曲辛联合帕罗西汀治疗组（联合组,n=65）。两组患者治疗周期均为4周,比较两组患者治疗前和治疗第2、4周的汉密尔顿抑郁量表（HAMD-17）评分、躯体化症状自评量表（SSS）评分、睡眠质量评分（PSQI）、神经心理状态评定量表（RBANS）;且治疗后对患者进行1个月的随访比较两组患者治疗后总体疗效及不良反应发生情况。结果 经治疗第2、4周联合组RBANS评分高于常规组（P<0.05）,而PSQI评分、SSS评分、HAMD-17评分均低于常规组（P<0.05）。治疗后1个月随访资料显示,两组患者不良反应总发生率比较,差异无统计学意义（P>0.05）,且总有效率高于常规组（P<0.05）。结论 氟哌噻吨美利曲辛联合帕罗西汀对MDD患者临床应用疗效确切,还可以帮助患者减轻躯体化症状,改善患者睡眠质量,并且提高患者认知功能。

Objective To investigate the effect of haloperitoxine melitraxine combined with paroxetine on somatic symptoms,sleep and cognitive function in patients with major depressive disorder（MDD）and its clinical application effects．Methods A retrospective analysis was performed on the relevant data of 120 patients with MDD who received treatment in our hospital from August 2020 to February 2023,and divided into conventional group（treated with paroxetine,55 cases）and combined group（haloperitoxetex melitraxine combined with paroxetine,65 cases）according to their different treatment regimens．The treatment duration of the two groups was 4 weeks,and the Hamilton Rating Scale for Depression（HAMD-17）score,Somatized Symptom Self-rating Scale（SSS）score,Sleep Quality Score（PSQI） and Neuropsychological State Rating Scale（RBANS）scores were compared before treatment and at the 2nd and 4th week of treatment．After treatment,the patients were followed up for 1 month,and the total efficacy and adverse reactions of the two groups of patients after treatment were compared．Results After 2 and 4 weeks of treatment,the combined group showed significantly higher RBANS scores compared to the control group（P<0.05）,while PSQI scores,SSS scores and HAMD-17 scores were significantly lower in the combined group compared to the control group（P<0.05）．One month after treatment,follow-up data showed that there was no statistically significant difference in the overall incidence of adverse reactions between the two groups（P>0.05）．Additionally,the total effective rate was significantly higher in the combined group compared to the control group（P<0.05）．Conclusions Haloperitoxine melitrexine combined with paroxetine has a definite clinical effect in patients with MDD,and can also help patients reduce somatization symptoms,improve patients' sleep quality,and improve patients' cognitive function．

目的 检验家庭睡眠习惯调查(FISH)在评估孤独症谱系障碍(ASD)患儿睡眠评估中的信度和效度。方法 随机抽取在清远市妇幼保健院儿童语言行为科干预的199例2~6岁ASD共患睡眠障碍患儿,其照顾者同时完成FISH和儿童睡眠习惯问卷(CSHQ),2周后再次同时完成上述两个问卷,以检验FISH的信度和效度。结果 验证性因素分析的结果表明,五因素模型拟合良好(χ²=79.05,df=44,χ²/df=1.80, P<0.001,SRMR=0.06,GFI=0.94,IFI=0.89,RMSEA=0.06),总量表及各分量表有较高的内部一致性信度(0.71~0.77)和重测信度(0.79~0.88)。FISH的白天习惯分别与CSHQ的入睡延迟、夜醒呈负相关,入睡前习惯分别与CSHQ的睡眠抵触、睡眠焦虑、白天睡眠呈负相关,睡眠常规分别与CSHQ的睡眠抵触、入睡延迟、睡眠焦虑呈负相关,睡前父母行为分别与CSHQ的睡眠抵触、睡眠焦虑呈负相关,总分与CSHQ总分呈负相关,差异均有统计学意义(P＜0.05)。结论 FISH具有较好的信度和效度,可作为ASD患儿睡眠习惯的评估工具。

Objective To test the reliability and validity of the famity inveritory of sleep habits(FISH) in the sleep assessment among children with autism spectrum disorder (ASD). Methods A random sample of 199 children with ASD and sleep disorders intervened in the Children's Language and Behavior Department of Maternal and Child Health Hospital of Qingyuan City were selected, their caregivers completed the FISH and the children's sleep habit questionnaire(CSHQ) at the same time, and completed the above two questionnaires again 2 weeks later to test the reliability and validity of the FISH. Results The results of confirmatory factor analysis showed that the five-factor model fits well (χ²=79.05, df=44, χ²/df=1.80, P<0.001, SRMR=0.06, GFI=0.94, IFI =0.89, RMSEA=0.06), the total scale and each subscale had high internal consistent reliability (0.71~0.77) and test-retest reliability (0.79~0.88). The daytime habits of FISH were negatively correlated with sleep delay and waking up at night of CSHQ respectively, the habits before sleep of FISH were negatively correlated with sleep conflict, sleep anxiety and daytime sleep of CSHQ respectively, the sleep routine of FISH was negatively correlated with sleep conflict, sleep delay and sleep anxiety of CSHQ respectively, the parents' behavior before sleep of FISH was negatively correlated with sleep conflict and sleep anxiety of CSHQ respectively, and the total score of FISH was negatively correlated with CSHQ, with statistically significant differences (P<0.05). Conclusions The FISH had good reliability and validity, and can be used as an assessment tool for children with ASD.

目的 探讨超低频经颅磁刺激(ILF-TMS)联合艾司唑仑对失眠症患者睡眠脑电图参数及血清神经营养因子表达的影响。方法 选取2018年8月—2020年4月我院失眠症患者114例,随机数字表法分为研究组(n=57)、对照组(n=57)。对照组予以艾司唑仑联合ILF-TMS假性刺激,研究组予以艾司唑仑联合ILF-TMS真性刺激,均治疗1个月。对比2组疗效与治疗前、治疗1个月后睡眠进程参数(总睡眠时间、入睡时间、睡眠效率、觉醒时间)、睡眠结构(非快速眼动睡眠期、快速动眼睡眠期)、匹兹堡睡眠质量量表(PSQI)评分、失眠严重程度指数量表(ISI)评分、焦虑自评量表(SAS)评分、抑郁自评量表(SDS)评分、血清神经营养因子[胶质细胞源性神经营养因子(GDNF)、脑源性神经营养因子(BDNF)]水平。结果 (1)疗效:研究组治疗1个月后总有效率高于对照组(P＜0.05);(2)睡眠进程参数:治疗1个月后研究组总睡眠时间、睡眠效率高于对照组,入睡时间、觉醒时间短于对照组(P＜0.05);(3)睡眠结构:治疗1个月后研究组Ⅲ期、Ⅱ期、非快速眼动睡眠期高于对照组,Ⅰ期睡眠期低于对照组(P＜0.05);(4)PSQI、ISI评分:治疗1个月后研究组PSQI、ISI评分低于对照组(P＜0.05);(5)SAS、SDS评分:治疗1个月后研究组SAS、SDS评分低于对照组(P＜0.05);(6)血清神经营养因子:治疗1个月后研究组血清GDNF、BDNF水平高于对照组(P＜0.05)。结论 ILF-TMS联合艾司唑仑治疗失眠症效果确切,可上调血清神经营养因子表达,改善睡眠脑电图参数,提高睡眠质量,控制焦虑、抑郁症状。

Objective To investigate the effects of infra-low frequency transcranial magnetic stimulation (ILF-TMS) combined with estazolam on sleep EEG parameters and serum neurotrophic factors expression in patients with insomnia. Methods One hundred and fourteen patients with insomnia in our hospital from August 2018 to April 2020 were divided into study group (n=57) and control group (n=57) by random number table method. The control group was treated with estazolam combined with pseudo ILF-TMS stimulation, and the study group was treated with estazolam combined with real ILF-TMS stimulation, all of which were treated for 1 month. Comparing curative effect of two groups before and 1 month after treatment, and sleep process parameters (total sleep time, falling asleep time, sleep efficiency, waking time), the structure of the sleep stages (stage Ⅲ, Ⅱ, Ⅰ, rapid eye movement sleep), Pittsburgh sleep quality index (PSQI), insomnia severity index (ISI), self-rating anxiety scale (SAS) score, self-rating depression scale (SDS) score, serum neurotrophic factors (GDNF, BDNF) levels. Results (1) Efficacy: the total effective rate of the study group was higher than that of the control group after 1 month of treatment (P＜0.05). (2) Sleep process parameters: after 1 month of treatment, the total sleep time and sleep efficiency in the study group were higher than those in the control group, and the falling asleep time and waking time were shorter than those in the control group (P＜0.05). (3) Sleep structure: after 1 month of treatment, compared to the control group, the study group had more in stageⅢ, Ⅱ, rapid eye movement sleep, and less in stage Ⅰsleep(P＜0.05). (4) PSQI and ISI scores: after 1 month of treatment, PSQI and ISI scores of the study group were lower than those of the control group (P＜0.05). (5) SAS and SDS scores: after 1 month of treatment, SAS and SDS scores in the study group were lower than those in the control group (P＜0.05). (6) Serum neurotrophic factors: after 1 month of treatment, serum GDNF and BDNF levels in the study group were higher than those in the control group (P＜0.05). Conclusions ILF-TMS combined with estazolam is an effective treatment of insomnia. It can up-regulate the expression of serum neurotrophic factors, improve the parameters of sleep EEG, improve sleep quality, and control the symptoms of anxiety and depression.

目的 应用斑点追踪显像定量评价阻塞性睡眠呼吸暂停综合征患者的左心房功能,并进行对比研究。方法 OSAS患者60例,根据睡眠呼吸暂停低通气指数(AHI)分为3组,轻度组,中度组,重度组,每组20人;另选择20名健康正常人作为正常对照组。采用二维斑点追踪成像技术测量各组左心房相关应变参数:收缩期应变(Ss),舒张早期应变(Se),舒张晚期应变(Sa),左心房收缩期应变率(SRs),左心房舒张早期应变率(SRe),左心房舒张晚期应变率(SRa),分析并比较各组间参数的差异性。结果 随着疾病严重程度的增加Ss、SRs、Se、SRe呈逐渐减低的趋势,而Sa、SRa先升高后减低,差异有统计学意义(P<0.05)。结论 应用斑点追踪成像技术可在OSAS患者发生左心房重构前检测出心房功能的变化。

Objective The left atrial function of patients with obstructive sleep apnea syndrome was quantitatively evaluated by speckle tracing imaging and compared. Methods Sixty patients with OSAS were divided into three groups according to the sleep apnea hypopnea index(AHI),including the mild group, the moderate group and the severe group, with 20 patients in each group. Another 20 healthy people were selected as the normal control group. Left atrial correlation strain parameters:systolic strain(Ss), early diastolic strain(Se), late diastolic strain(Sa), left atrial systolic strain rate(SRs), early diastolic strain rate(SRe), left atrium left atrium late diastolic strain rate(SRa) were measured by two dimensional speckle tracking imaging technology, and the differences of parameters between groups were compared. Results With the increase of disease severity, Ss, SRs, Se and SRe showed a trend of gradual decrease, while Sa and SRa increased first and then decreased, and the difference was statistically significant(P<0.05). Conclusion Changes in atrial function may be detected in OSAS patients prior to left atrial remodeling using speckle tracking imaging.

目的 本研究通过调查中国华南地区一间大型医疗机构(综合医院)中护士日间过度嗜睡的发生率及相关影响因素。方法 纳入了1 102名在职护士要求他们在一段规定的时间内完成一份自我报告问卷,其中包括人口学资料采集、生活习惯(BMI、小睡习惯、打鼾等)、失眠、抑郁、焦虑、MEQ分型、倒班、工作兴趣等与工作及睡眠相关的特征。了解EDS在被试人群中的发生率及其影响因素。结果 共有1 048名护士有效的完成了问卷(应答率为95.1%)。其中169名(16.1%)护士存在日间过度嗜睡(EDS)。抑郁症状(校正后的OR值= 2.24,95%的可信区间 1.51～3.31)、焦虑症状(1.65; 1.02～2.67)、失眠(2.29; 1.56～3.36)、倒班工作(1.98; 1.03～3.83)和对工作的低兴趣(1.74; 1.01～2.99)是EDS发生的独立危险因素。结论 日间过度嗜睡(EDS)在华南地区的综合医疗机构中的青年护士群体中普遍存在。EDS的发生可能与抑郁症状、焦虑症状、失眠、倒班工作和对工作的低兴趣存在相关。

Objective To investigate the prevalence and correlates of excessive daytime sleepiness EDS in a population of hospital nurses in South China. Methods A total of 1 102 nurses working in a large medical center were invited to participate in this cross-sectional study (females 96.9%,mean age 29.6 years). They all completed a self-reported questionnaire consisting of items on demographic variables,lifestyle factors,insomnia,anxiety,depression,and both work-related and sleep related characteristics. Results A total of 1 048 nurses gave a valid response (response rate 95.1%). Among them,169 (16.1%) reported EDS as defined as an Epworth Sleepiness Scale≥14. Depression (adjusted odds ratio=2.24,95% confidence interval 1.51～3.31),anxiety (1.65; 1.02 ～2.67),insomnia (2.29; 1.56～3.36),rotating shift work (1.98; 1.03～3.83) and low interest in work (1.74; 1.01～2.99) were all independent risk factors of the occurrence of EDS. Conclusion EDS were common among this relatively young and healthy nurse population in south China. There were clear associations with EDS and depression,anxiety,insomnia,rotating shift work and low work-related interest.

目的 应用三维斑点追踪成像(3D-STI)技术评价睡眠呼吸暂停综合征患者左、右心室整体收缩功能。方法 OSAS患者60例,根据睡眠呼吸暂停低通气指数(AHI)分为3组,轻度组,中度组,重度组,每组20人;另选择20名健康正常人作为正常对照组。用三维斑点追踪成像技术测量各组左心室整体纵向应变(LVGLS)、圆周应变(LVGCS)、径向应变(LVGRS)、面积应变(LVGAS)以及右心室整体纵向应变(RVGLS)、圆周应变(RVGCS)、径向应变(RVGRS),并比较各组间参数的差异。结果 与轻度OSAS组比较,中、重度OSAS组LVGLS、LVGAS降低,差异有统计学意义(P<0.05);与中度OSAS组相比较,重度组LVGLS、LVGCS、LVGRS以及LVGAS均降低,差异有统计学意义(P<0.05);右心室部分应变参数变化早于左心室。结论 应用3D-STI技术能够在患者左心室射血分数(LVEF)发生改变之前发现早期左、右心室功能收缩障碍,为临床早期诊断及干预提供可靠的依据。

Objective To evaluate left and right ventricular systolic function of patients with obstructive sleep apnea syndrome (OSAS) by using three-dimensional speckle tracking imaging(3D-STI). Methods Sixty patients with OSAS were divided into three groups according to the sleep apnea hypopnea index (AHI), the mild group, the moderate group and the severe group, with 20 patients in each group. Another 20 healthy people were selected as the normal control group. The left ventricle global longitudinal strain (LVGLS), left ventricle global circumferential strain (LVGCS), left ventricle global radial strain (LVGRS), left ventricle global area strain (LVGAS) and right ventricle global longitudinal strain (RVGLS), right ventricle global circumferential strain (RVGCS) and right ventricle global radial strain (RVGRS) were measured by three-dimensional speckle tracking imaging technology, and the differences of parameters between groups were compared. Results Compared with mild OSAS group, LVGLS and LVGAS were decreased in moderate and severe OSAS groups, and the difference was statistically significant (P<0.05). Compared with the moderate OSAS group, LVGLS, LVGCS, LVGRS and LVGAS in the severe group all decreased, and the difference was statistically significant (P<0.05). Some of right ventricle strain parameters were earlier than that of left ventricle. Conclusion The application of 3D-STI technology can detect early left and right ventricular dysfunction before left ventricular ejection fraction(LVEF)changes, provide a reliable basis for early clinical diagnosis and intervention.

目的 研究疫情下护理人员的情绪障碍和睡眠障碍情况。方法 应用广泛性焦虑障碍量表(GAD-7),病人健康问卷(抑郁)(PHQ-9),病人健康问卷(躯体症状)(PHQ-15)和匹兹堡睡眠质量指数(PSQI)量表对临床一线护理人员进行心理和睡眠问卷调查,统计情绪和睡眠障碍的发病率,以及其相关性。结果 126名完成量表的临床一线护理人员,焦虑,抑郁,躯体症状,睡眠障碍的发病率分别为:41.9%、31.5%、9.5%和30.8%。相关性分析显示学历,年龄,婚育情况及是否为独生子女与上述情绪、睡眠障碍有相关,差异有统计学意义(P <0.05)。结论 临床一线护理人员焦虑和睡眠障碍发病率高,且二者明显相关,存在相互影响。建议医院随时更新知识指南,加强对护理人员的心理疏导和人文关怀,以减轻护理人员的心理压力。

Objective To study the emotional and sleep disorders of nursing staff under the emerging infections diseases. Methods The generalized anxiety disorder scale anxiety (GAD-7), patient health questionnaire 9(depression)(PHQ-9), patient health questionnaire 15 (somatic symptoms)(PHQ-15), and Pittsburgh sleep quality index (PSQI)were used in our investment. Statistics on the incidence of emotional and sleep disorders, and their correlation were done in our study. Results The incidence of anxiety, depression, physical symptoms, and sleep disorders in 126 nurses were 41.9%, 31.5%, 9.5%, and 30.8%, respectively. Correlation analysis showed that education, age, marital status, and whether or not they were the only children in the family were related to the above-mentioned emotions and sleep disorders (P<0.05). Conclusion The incidence of anxiety and sleep disorders in clinical front-line nurses is high. There are high and significant correlation and interaction between mood and sleep disorders. It is recommended that hospital need to update the knowledge and strengthen the psychological counseling and humanistic care of the nursing staff to reduce the psychological pressure of the nursing staff.

目的 通过波幅整合脑电图(aEEG)长程监测评估胆红素水平(TSB)、脑干听觉诱发电位(BAEP)及脑电图(EEG)异常程度对足月新生儿睡眠结构的影响。方法 对159例高胆红素血症足月新生儿行12小时床边监测长程脑电图,计算aEEG上睡眠-觉醒周期(SWC)安静睡眠(QS)时间长度比例、收集当日的TSB、BAEP及EEG结果。结果 在159例病人中,数据可视化结果显示随着胆红素水平的升高、EEG及BAEP异常程度的增加,QS期的比例逐渐减少。逐步广义线性模型结果证实胆红素水平及EEG异常是导致安静睡眠比例减少的主要因素,而BAEP异常程度则不显著。结论 随着胆红素水平的增高及脑电图异常率的增加,足月新生儿睡眠-觉醒周期安静睡眠比例逐渐减少,SWC结构发生改变。

Objective To investigate the impacts of total serum bilirubin level (TSB), EEG and BAEP abnormalities to full term neonates' sleep-wake cycles' (SWC) structure through the amplitude-integrated electroencephalography (aEEG). Methods Quiet sleep (QS) ratio of SWC within 12 hours of 159 neonates with hyperbilirubinermia were obtained from the aEEG traces, total serum bilirubin (TSB) level, EEG and BAEP results of the recording day were also recorded. Results QS ratio of SWC decreased along with the elevated TSB level, EEG and BAEP abnormality in 159 cases. Furthermore stepwise generalized linear regression model comfirmed the TSB level, EEG abnormalities were the key factors for the reduced QS ratio while the BAEP was no statistically significant. Conclusion Full term neonates' SWC showed a constructive change by means of QS ratio reduction according to the elevating TSB level and EEG abnormality.

目的 分析研究不同类型脑梗死患者睡眠结构及其与抑郁的相关性,为脑梗死患者睡眠障碍及抑郁的治疗提供新的思路及理论支持。方法 抽取我院2012年4月—2015年5月接收的124例脑梗死患者进行分组研究,根据脑梗死不同发生部位将患者分为四组,分别为小脑梗死组30例、皮层梗死组33例、脑干梗死组29例及皮层下梗死组32例,对比观察四组患者睡眠结构及睡眠参数和睡眠障碍、HAMD评分的相关性。结果 四组患者睡眠结构相比存在明显差异,脑干梗死组和皮层下梗死组觉醒时间远多于小脑梗死组和皮层梗死组,小脑梗死组NREM 1+2期、NREM期明显短于皮层梗死组、脑干梗死组及皮层下梗死组,小脑梗死组REM期、NREM 3+4期明显大于皮层梗死组、脑干梗死组及皮层下梗死组,各项数据对比差异均有统计学意义(P＜0.05);HAMD评分、PSQI评分和NREM1+2期、觉醒指数呈正相关关系(P＜0.05,r＞0);与REM期和NREM 3+4期呈负相关关系(P＜0.05,r＜0)。结论 皮层下梗死睡眠结构紊乱发生率更高,并且睡眠结构的变化和脑梗死后抑郁评分、睡眠障碍评分具有一定关系。

Objective To study the correlation between sleep structure and depression in patients with different types of cerebral infarction,to provide new ideas and theoretical support for the treatment of sleep disorders and depression in patients with cerebral infarction. Methods 124 patients with cerebral infarction in our hospital from April 2012 to May 2015 were selected. They were divided into four groups according to the different parts of the cerebral infarction, respectively, 30 cases of cerebellar infarction group, 33 cases of cortical infarction group, 29 cases of brainstem infarction group and 32 cases of subcortical infarction group. The correlation of sleep structure and sleep parameters, sleep disorder and HAMD score of the four groups were observed and compared. Results There was a significant difference in sleep structure between the four groups. Brainstem infarction group and subcortical infarction group awakening time was far more than that of cerebellar infarction group and cortex infarction group.Cerebellar infarction group NREM 1+2, NREM period was significantly shorter in cortical infarction, brain stem infarction group and subcortical infarction group. Cerebellar infarction group of REM and NREM stage 3+4 were significantly greater than that of cortical infarction death group, brain stem infarction group and cerebral cortex infarction group. The differences were statistically significant(P<0.05);HAMD score, PSQI score and NREM1+2 period, arousal index was positively correlated (P<0.05, r> 0); And REM phase and 3+4 NREM phase was negatively correlated (P<0.05, r< 0). Conclusion Subcortical infarction sleep structure disorder incidence is higher, and the sleep structure changes and infarction depression score, sleep disorder score has a certain relationship.