BACKGROUND & AIMS: :Chronic obstructive pulmonary disease (COPD) is common and often undiagnosed in its early stages, especially in smokers, who are also most at risk. Patients can develop severe or very severe disease before they consult a physician. It is therefore important to identify patients at-risk of COPD and check their lung function regularly since early stage disease is often asymptomatic or mistaken for asthma. Primary care physicians are often the first health care providers to encounter patients with COPD in the early stages, and their role in early detection and treatment process is pivotal. Spirometry is a cheap, simple and reliable method for the early detection and monitoring of COPD patients, and for establishing a differential diagnosis. Spirometry gives immediate results and communicating the results to smokers has been shown to motivate them to quit. Early diagnosis and appropriate therapy can positively influence disease course, slowing progression, relieving symptoms and reducing the incidence of acute 'flares', or exacerbations.

背景与目标： : 慢性阻塞性肺疾病 (COPD) 很常见，并且在早期阶段通常无法诊断，尤其是吸烟者，他们的风险也最大。在咨询医生之前，患者可能会患上严重或非常严重的疾病。因此，重要的是要确定有COPD风险的患者并定期检查其肺功能，因为早期疾病通常是无症状的或被误认为哮喘。初级保健医生通常是第一个在早期阶段遇到COPD患者的医疗保健提供者，他们在早期发现和治疗过程中的作用至关重要。肺活量测定法是一种廉价、简单、可靠的方法，可用于COPD患者的早期检测和监测，并建立鉴别诊断疾病。肺活量测定法可立即得出结果，并将结果传达给吸烟者已被证明可以激发他们戒烟。早期诊断和适当的治疗可以积极影响病程，减缓进展，缓解症状并减少急性 “急症” 或加重的发生率。

BACKGROUND & AIMS: BACKGROUND:Smoking cessation is the most important therapeutic intervention in patients with chronic obstructive pulmonary diseases (COPD) and the health benefits are immediate and substantial. Major efforts have been made to develop methods with high smoking cessation rates. OBJECTIVES:To study whether a combination of spirometry and brief smoking cessation advice to smokers with COPD, annually for three years, increased their smoking cessation rate in comparison with groups of smokers with normal lung function. METHOD:Prospective, randomized study in primary care. Smoking cessation rates were compared between smokers with COPD followed-up yearly over a period of three years and smokers with normal lung function followed-up yearly for three years or followed-up only once after three years. RESULTS:The point-prevalence abstinence rate and prolonged abstinence rate at 6 and 12 months increased yearly and in smokers with COPD at year 3 was 29%, 28%, and 25%, respectively. The abstinence rates were significantly higher in smokers with COPD than in smokers with normal lung function. Smoking cessation rates among smokers with normal lung function did not increase with increasing number of follow-ups. CONCLUSION:Smokers diagnosed with COPD stopped smoking significantly more often than those with normal lung function.

背景与目标：

BACKGROUND & AIMS: OBJECTIVES:Frequent monitoring of forced vital capacity at home may be of added value in patients with SSc-associated interstitial lung disease (SSc-ILD) to monitor disease progression and guide treatment decisions. The aim of this study was to evaluate the feasibility and optimal frequency of online home spirometry using a home monitoring application in patients with SSc-ILD. METHODS:This was a prospective, observational study in patients with SSc-ILD. Patients evaluated for 3 months the online home monitoring application ILD-online integrated with a Bluetooth-connected spirometer. Patients performed daily home spirometry for 6 weeks and weekly home spirometry for 6 weeks. In addition, patients completed an evaluation questionnaire after 3 months and online patient-reported outcomes at baseline and 3 months. RESULTS:Ten consecutive patients participated. Mean adherence to home spirometry was 98.8% (s.d. 1.5). Home and hospital spirometry were highly correlated. The mean coefficient of variation was lower for weekly [2.45% (s.d. 1.19)] than daily [3.86% (s.d. 1.45)] forced vital capacity measurements (P = 0.005). All patients considered the home monitoring application and spirometer easy to use and no patients considered home spirometry burdensome. All patients would recommend home monitoring to other patients with SSc. CONCLUSIONS:Home spirometry using an online home monitoring application is feasible in patients with SSc-ILD, with high adherence and patient satisfaction. Larger long-term studies are needed to assess whether home spirometry can detect the progression of ILD in patients with SSc.

背景与目标：

BACKGROUND & AIMS: -2

背景与目标： -2

BACKGROUND & AIMS: :The aim of the present study was to provide new spirometry reference equations in a sample of the Brazilian population for the following parameters: forced vital capacity (FVC), forced expiratory volume in 1 second (FEV1), FEV1/FVC ratio, peak of expiratory flow (PEF), forced expiratory flow at 50% (FEF50%), 75% average vital capacity (FEF25-75%), and average forced expiratory flow time (FEFT). This was a prospective study using results from chest radiographs, electrocardiograms, and questionnaires to investigate the participants' respiratory symptoms, sedentarism, and comorbidities (Charlson comorbidity index). From December 2010 to July 2014, individuals were randomly selected from various locations in the state of Rio de Janeiro. All individuals were examined by a single technician in the morning at the laboratory, and performed the spirometry with the same spirometer. Spirometry values were tabulated for the creation of three equation models: linear regression, logarithmic regression, and logarithms through a method that incorporates the lambda, median, and coefficient of variation (LMS method). Initially, 7003 individuals from both genders were contacted, and 454 were recruited. The data from the new equations were compared with one Brazilian and eight international equations, resulting in a high correlation (r>0.9). The values derived from the LMS method and linear regression were very similar (P>0.5), and both could be used to acquire the reference values for Brazilian spirometry. Data derived from the equations of this study were different from the current Brazilian equation, which could be justified by the different method used.

背景与目标： : 本研究的目的是为以下参数在巴西人群样本中提供新的肺活量参考方程: 强制肺活量 (FVC)，1秒强制呼气量 (FEV1)，FEV1/FVC比，呼气流量峰值 (PEF)，50% 时的强制呼气流量 (FEF50 %)，75% 平均肺活量 (FEF25-75 %) 和平均强制呼气流量时间 (FEFT)。这是一项前瞻性研究，使用胸部x光片，心电图和问卷调查的结果来调查参与者的呼吸道症状，镇静和合并症 (Charlson合并症指数)。从2010年12月到2014年7月，从里约热内卢州的各个地方随机选择个人。早晨，所有个人都由一名技术人员在实验室进行了检查，并使用相同的肺活量计进行了肺活量测定。通过结合 λ，中位数和变异系数 (LMS方法) 的方法，列出了用于创建三个方程模型的肺活量测定值: 线性回归，对数回归和对数。最初，接触了来自两种性别的7003个人，并招募了454个人。将来自新方程的数据与一个巴西方程和八个国际方程进行比较，导致高度相关性 (r>0.9)。从LMS方法和线性回归得出的值非常相似 (P>0.5)，并且两者都可以用于获得巴西肺活量测定法的参考值。从这项研究的方程式得出的数据与当前的巴西方程式不同，这可以通过使用的不同方法来证明。

BACKGROUND & AIMS: BACKGROUND:Restriction is a typical functional abnormality in interstitial lung disease (ILD) patients, but is not always present, especially in the early stage of the disease. The greater reduction of vital capacity (VC; %pred.) than total lung capacity (TLC; %pred.) is regarded as a typical pattern of lung function disturbances in ILD patients. STUDY OBJECTIVES:To explore the diagnostic value of spirometry in a detection restrictive pattern the relative volume loss assessed by TLC and VC in large series of patients with a diagnosis of ILD referred for lung function tests was evaluated. METHODS:Retrospective, cross-sectional analysis of pulmonary function data was done. The sampleconsisted of 1,173 patients with the diagnosis of different interstitial lung diseases investigated during a period of 5 years. Only patients without airway obstruction (normal FEV1%VC) were included. In all cases spirometry and whole body plethysmography were performed by experienced staff using MasterLab - 'Jaeger' equipment according to ERS standards. Reference values according to ERS guidelines were applied. RESULTS:The mean value of TLC expressed as %pred. was significantly (p < 0.001) lower than VC in all patients (93.7 +/- 18.6 vs. 98.0 +/- 21.4%pred.). The frequency of abnormal (lowered) TLC results was also higher than lowered VC (22.8 vs. 17.8%). Sensitivity of VC reached 69.3% and the positive predictive value was 88.5% in detecting volume restriction as compared to TLC measurement. CONCLUSION:The relative loss of TLC was greater than VC in our large group of patients. Measurement of TLC should be part of functional assessment of ILD patients, irrespective of whether they present or do not present a restrictive pattern in spirometry.

背景与目标：

BACKGROUND & AIMS: :Inflammatory processes affecting nasal and bronchial mucosa are similar in nature. The purpose of this study was to examine whether children with perennial allergic rhinitis, without underlying asthma, have impaired pulmonary function. We also investigated whether nasal corticosteroids and loratidine would improve the pulmonary function tests of those children with impaired lung function. Fifty subjects with moderate/severe persistent allergic rhinitis due to exclusively dust mite sensitization and no past medical history suggestive of asthma were assessed. The control group consisted of 26 matched healthy subjects. Subjects with airway obstruction, as detected by forced expiratory volume/1 s (FEV1) or forced expiratory flow from 25/% to 75% (FEF(25-75)) values <80% of those predicted, were treated with loratidine, once a day for 10 days, and daily nasal budesonide for 3 months. We found that 11 of 50 patients (22%) with perennial allergic rhinitis had impaired pulmonary function (FEF(25-75) values <80%), compared to 1/26 (3.8%) of the control group (p < or = 0.05). Reversibility was observed in 9/11 (81.8%), mean 24.7% +/- 10.3%. Within 3 months of treatment, 7/10 had FEF(25-75) > 80% of their predicted values as well as significant improvements in their FEV1 (p = 0.04), and FEV1/FVC (p = 0.04). We conclude that a substantial proportion of children with perennial allergic rhinitis have diminished FEF (25-75) values and reversible airway obstruction. Nasal corticosteroids improve the pulmonary function tests of these children with impaired lung function.

背景与目标： : 影响鼻和支气管粘膜的炎症过程在性质上是相似的。这项研究的目的是检查患有常年性变应性鼻炎且没有潜在哮喘的儿童是否肺功能受损。我们还研究了鼻皮质类固醇和氯替丁是否会改善那些肺功能受损的儿童的肺功能测试。评估了50名因仅尘螨致敏而患有中度/重度持续性过敏性鼻炎的受试者，并且没有既往病史提示哮喘。对照组由26名匹配的健康受试者组成。通过强制呼气量/1 s (FEV1) 或强制呼气流量从25/% 至75% (FEF(25-75)) 值 <预测值的80% 检测到的气道阻塞的受试者，接受loratidine治疗，每天一次，持续10天，和每日经鼻布地奈德治疗3个月。我们发现，与对照组的1/26 (3.8%) 相比，50例常年性变应性鼻炎患者中有11例 (22%) 肺功能受损 (FEF(25-75) 值 <80%) (p <或 = 0.05)。在9/11 (81.8%) 中观察到可逆性，平均24.7% +/- 10.3%。在治疗的3个月内，7/10的FEF(25-75)> 其预测值的80%，以及其FEV1 (p = 0.04) 和FEV1/FVC (p = 0.04) 的显著改善。我们得出的结论是，患有常年性变应性鼻炎的儿童中有很大一部分的FEF (25-75) 值降低和可逆性气道阻塞。鼻皮质类固醇可改善这些肺功能受损儿童的肺功能测试。

BACKGROUND & AIMS: INTRODUCTION:The vagus nerve plays a special role in the control of respiratory system activity which represents the parasympathetic part of the autonomic nervous system. A small bronchial innervation by the sympathetic system also is observed, and there is a significant expression of adrenergic receptors, in particular β⊂2 receptors, in the airways. The development of genetics and molecular biology allows for a detailed study which can clarify the essential elements in the pathogenesis of many types of lung disease, as well as the physiological phenomena - bronchial smooth muscle tone and their contractile mechanism. MATERIAL AND METHODS:The study involved 148 healthy male volunteers aged 20-26. In all subjects, gene polymorphism at nucleotide position 46 and 79 of β⊂2-adrenergic receptor (β⊂2-ADR) was assessed. According to the gene polymorphism data, we divided the whole examined population of males into 6 groups for further studies. Moreover, in all the subjects, we performed spirometry testing to verify their pulmonary functions. RESULTS:The basic values of spirometry tests in all subjects were in the range of normal values. The frequency of different genotypes in the gene polymorphism of the β⊂2-adrenergic receptor at nucleotide positions 46 and 79 were typical for the Caucasian population. Analysis of the output values of spirometry, conducted in the particular groups based on their genotype, showed significant inter-group differences in the selected spirometry tests. CONCLUSIONS:Our results may be useful in explaining the differences in the measured values of spirometric indices in healthy subjects in relation to the polymorphism of β⊂2-ADR, and may also contribute to the verification of standards for spirometric indices for this selected group of young males in the Polish population.

背景与目标：

BACKGROUND & AIMS: BACKGROUND AND OBJECTIVE:Although guidelines for asthma emphasize the importance of spirometry for continuity and evaluation of care, it is underused in general practice. The objective of this study was to investigate the effect of spirometry and medical review on asthma control in general practice over 12 months. METHODS:Patients were recruited through 31 practices, which were randomly allocated to one of three groups: Group A had 3-monthly spirometry with medical review, Group B spirometry only before and after the trial, and Group C usual care. Asthma control data were analysed by intention to treat using non-parametric tests and logistic regression models fitted to allow for confounders, repeated measures and clustering by practice. RESULTS:The trial was completed by 195 patients (Group A 69, Group B 78, Group C 48). Asthma control improved in all groups during the 12 months trial, most impressively in Group A (odds ratio per 3 months = 1.27, 95% confidence interval: 1.08-1.49, P = 0.004), but the difference between the groups' respective 3-monthly changes was not significant. At 6 months, asthma control in Group A had increased more from baseline than in Groups B + C (P = 0.006). CONCLUSIONS:Regular spirometry with medical review was associated with improved asthma control in general practice patients, while there was less improvement in either the spirometry only or usual care group. The mechanisms of this improvement may include appropriate adjustment of medication and improved compliance.

背景与目标：

BACKGROUND & AIMS: :The reliability of spirometry is dependent on strict quality control. We examined whether quality control criteria recommended for adults could be applied to children aged 2-5 years. Forty-two children with cystic fibrosis and 37 healthy children attempted spirometry during their first visit to our laboratory. Whereas 59 children (75%) were able to produce a technically satisfactory forced expiration lasting 0.5 second, only 46 (58%) could produce an expiration lasting 1 second, with the youngest children having the most difficulty. Start of test criteria for adults were inappropriate for this age group, with only 16 of 59 children producing a volume of back extrapolation as a proportion of forced vital capacity of less than 5%, whereas all but 4 could produce a volume of back extrapolation of 80 ml or less. More than 90% of children were able to produce a second forced vital capacity and a second forced expired volume in 0.75 second within 10% of their highest. Errors in the spirometry software resulted in inaccurate reporting of expiratory duration and inappropriate timed expired volumes in some children. We describe recommendations for modified start of test and repeatability criteria for this age group, and for improvements in software to facilitate better quality control.

背景与目标： : 肺活量测定的可靠性取决于严格的质量控制。我们检查了是否可以将成人推荐的质量控制标准应用于2-5岁的儿童。42名患有囊性纤维化的儿童和37名健康儿童在首次访问我们的实验室时尝试进行肺活量测定。尽管59名儿童 (75% 名) 能够产生技术上令人满意的持续0.5秒的强制呼气，但只有46名儿童 (58% 名) 能够产生持续1秒的呼气，其中最小的儿童最困难。成人的开始测试标准不适合该年龄组，59名儿童中只有16名产生的背部外推量与强迫肺活量的比例小于5%，而4名儿童以外的所有儿童都可以产生80毫升或更少的背部外推量。超过90% 的儿童能够在0.75秒内产生第二次强制肺活量和第二次强制过期量，在其最高10% 范围内。肺活量测定软件中的错误导致某些儿童的呼气持续时间报告不准确，并且定时过期量不适当。我们描述了针对该年龄段的修改测试开始和可重复性标准的建议，以及对软件进行改进以促进更好的质量控制的建议。

BACKGROUND & AIMS: BACKGROUND:Significant morbidity and mortality in patients with sickle cell disease are accounted for by lung complications. To facilitate good respiratory care for children with sickle cell anaemia the generation of local predicted values is highly important. OBJECTIVE:To determine the reference equations for spirometry indices estimation in children with sickle cell anaemia, which can be readily used as proxy when there is no easy accessibility to spirometer. METHODS:A cross-sectional study with linear regression models developed to estimate reference values for spirometric indices in Nigerian children with sickle cell anaemia aged 5-12 years. RESULTS:Age as independent variables for estimation of forced expiratory volume in 1 s (FEV1) was associated with lowest coefficient of determination (R2) and highest standard error. The coefficient of determination (R2) and standard error was highest and lowest, respectively, when arm span was used to determine peak expiratory flow rate (PEFR). Prediction models for PEFR and FEV1 gave the closest mean estimates that were 0.18 and 0.16 lower and higher than the actual mean PEFR and FEV1, respectively, but the differences was significant only in FEV1. On the contrary the prediction models for forced vital capacity (FVC) gave mean estimates that was 1.02 higher than the actual mean FVC, however, the finding was not significant. CONCLUSION:Preferred proxy for spirometry indices in children with sickle cell anaemia may be arm span.

背景与目标：

BACKGROUND & AIMS: :Following the occurrence of metal fume fever in some subjects after the installation of an electric furnace in a steel plant, a survey was undertaken to examine whether subjects exposed to fumes containing zinc oxide would exhibit a detectable impairment in ventilatory function, and whether a forced oscillation technique (FOT) was more suited for this detection than conventional spirometry. Pulmonary function measurements were made in 57 exposed workers (production or maintenance) and 55 nonexposed workers (maintenance or strandcasting department) at the beginning and near the end of a work shift (day or night). Maximal expiratory volumes and flows were measured by means of a pneumotachograph, and respiratory resistance (Rrs) and reactance at various frequencies by means of a FOT. These measurements were repeated 1 day later. During the day shift, there were no significant differences in pulmonary function between exposed and control workers. However, during the night shift, an influence of exposure on pulmonary function was revealed both by spirometry and by FOT: workers exposed at night showed a slight decrease in vital capacity (VC) and in forced expiratory volume in one second (FEV1), and a decline in respiratory resistance (Rrs) with oscillation frequency, that were more marked than in unexposed subjects. In contrast to the frequency dependence of Rrs, the changes of lung volumes and expiratory flows were related to differences in initial values between exposed and nonexposed workers. The decrease in FEV1 was maintained the day after exposure. The forced oscillation technique proved at least as sensitive as spirometry to detect small across-shift changes in ventilatory function. Although the effects on pulmonary function were small, it is likely that they represent a subclinical response to the inhalation of small quantities of zinc oxide.

背景与目标： : 在钢铁厂安装电炉后，某些受试者发生金属烟雾发热后，进行了一项调查，以检查暴露于含有氧化锌的烟气中的受试者是否会表现出可检测到的通气功能障碍，以及强制振荡技术 (FOT) 是否比传统的肺活量测定法更适合这种检测。在轮班开始和接近结束时 (白天或晚上)，对57名暴露的工人 (生产或维护) 和55名非暴露的工人 (维护或施放部门) 进行了肺功能测量。通过呼吸速度描记器测量最大呼气量和流量，并通过FOT测量各种频率下的呼吸阻力 (Rrs) 和电抗。1天后重复这些测量。在白班期间，暴露和对照工人之间的肺功能没有显着差异。然而，在夜班期间，通过肺活量测定和FOT揭示了暴露对肺功能的影响: 夜间暴露的工人在一秒钟内显示肺活量 (VC) 和用力呼气量 (FEV1) 略有下降，呼吸阻力 (Rrs) 随振荡频率的下降，比未暴露的受试者更明显。与Rrs的频率依赖性相反，肺容积和呼气流量的变化与暴露和非暴露工人之间的初始值差异有关。暴露后第二天保持FEV1的下降。事实证明，强制振荡技术至少与肺活量测定法一样灵敏，可以检测通气功能的小跨移位变化。尽管对肺功能的影响很小，但它们很可能代表了对吸入少量氧化锌的亚临床反应。

BACKGROUND & AIMS: :Background: Spirometry is the most common pulmonary function test. It is widely used in the assessment of lung function to provide objective information used in the diagnosis of lung diseases and monitoring lung health. In 2005, the American Thoracic Society and the European Respiratory Society jointly adopted technical standards for conducting spirometry. Improvements in instrumentation and computational capabilities, together with new research studies and enhanced quality assurance approaches, have led to the need to update the 2005 technical standards for spirometry to take full advantage of current technical capabilities.Methods: This spirometry technical standards document was developed by an international joint task force, appointed by the American Thoracic Society and the European Respiratory Society, with expertise in conducting and analyzing pulmonary function tests, laboratory quality assurance, and developing international standards. A comprehensive review of published evidence was performed. A patient survey was developed to capture patients' experiences.Results: Revisions to the 2005 technical standards for spirometry were made, including the addition of factors that were not previously considered. Evidence to support the revisions was cited when applicable. The experience and expertise of task force members were used to develop recommended best practices.Conclusions: Standards and consensus recommendations are presented for manufacturers, clinicians, operators, and researchers with the aims of increasing the accuracy, precision, and quality of spirometric measurements and improving the patient experience. A comprehensive guide to aid in the implementation of these standards was developed as an online supplement.

背景与目标： 背景: 肺活量测定是最常见的肺功能检查。它被广泛用于肺功能评估，以提供用于诊断肺部疾病和监测肺部健康的客观信息。2005年，美国胸科学会和欧洲呼吸学会共同采用了进行肺活量测定的技术标准。仪器和计算能力的改进，加上新的研究和增强的质量保证方法，导致需要更新2005的肺活量测定技术标准，以充分利用当前的技术能力。方法: 本肺活量测定技术标准文件是由一个国际联合工作队制定的，由美国胸科学会和欧洲呼吸学会任命，在进行和分析肺功能测试，实验室质量保证以及制定国际标准方面具有专业知识。对已发表的证据进行了全面审查。进行了一项患者调查以获取患者的经验。结果: 对2005肺活量测定技术标准进行了修订，包括添加了以前未考虑的因素。在适用时引用了支持修订的证据。任务组成员的经验和专业知识被用来开发推荐的最佳实践。结论: 为制造商、临床医生、操作员和研究人员提供标准和共识建议，目的是提高肺活量测量的准确性、准确性和质量，并改善患者体验。作为在线补充，开发了一份协助实施这些标准的综合指南。

BACKGROUND & AIMS: BACKGROUND:Early detection of lung disease may help reduce disease development. Detection through preventive health checks may be beneficial. Nevertheless, the knowledge is sparse on how to enhance the participation rate in health checks among citizens at risk of developing lung disease. This study investigates if focused information on spirometry can increase the participation rate in a general health check. METHODS:We conducted an open-label, household cluster-randomised trial with a two-group parallel design including 4407 citizens aged 30-49 years in Denmark and an average cluster size of 1.55 citizens per household. The control group (n = 2213) received a standard invitation describing the content of the general health check and containing practical information. The intervention group (n = 2194) received an extended invitation highlighting the benefits of early detection and prevention of lung disease. The primary outcome was difference in participation rate between the two groups. The secondary outcome was the proportion of participants at risk of lung disease in both groups. Risk profile was defined as current smoking or self-reported lung symptoms. The inclusion period was 25 November 2015-3 February 2017. RESULTS:No major difference in participation rate was seen between the intervention group (53.4%) and the control group (52.0%). Participants had statistically significantly higher education level compared to non-participants. A total of 24.2% of the participants were at risk of developing lung disease, but no difference was found between the intervention group and the control group. CONCLUSION:This study revealed no effect on participation rate of including focused spirometry information in the health check invitation. TRIAL REGISTRATION:ClinicalTrials.gov: NCT02615769 . Registered on 25 November 2015. The trial protocol has been published.

背景与目标：

BACKGROUND & AIMS: :Prediction bias in spirometry reference equations can arise from combining equations for different age groups, rounding age or height to integers or using self-reported height. To assess the bias arising from these sources, the fit of 13 prediction equations was tested against the Global Lungs Initiative (GLI) dataset using spirometric data from 55,136 healthy Caucasians (54% female). The effects on predicted values of using whole-year age versus decimal age, and of a 1% bias in height, were quantified. In children, the prediction bias relative to GLI ranged from -22% to +17%. Switching equations at 18 yrs of age led to biases of between -846 (-14%) and +1,309 (+38%) mL. Using age in whole years rather than decimal age introduced biases from -8% to +7%, whereas a 1% overestimation of height introduced bias that ranged from +1% to +40%. Bias was greatest in children and adolescents, and in short elderly subjects. Using a single spirometry equation applicable across all ages and populations reduces prediction bias. Measuring and recording age and height accurately are also essential if bias is to be minimised.

背景与目标： : 肺活量测定参考方程中的预测偏差可以通过组合不同年龄组的方程，将年龄或身高四舍五入为整数或使用自我报告的身高而产生。为了评估这些来源产生的偏差，使用来自55,136名健康高加索人 (54% 名女性) 的肺活量测量数据，针对全球肺部倡议 (GLI) 数据集测试了13个预测方程的拟合度。量化了使用全年年龄与十进制年龄以及身高1% 偏差对预测值的影响。在儿童中，相对于GLI的预测偏差范围为-22% 至 + 17%。在18岁时切换方程导致-846 (-14%) 和 + 1,309 (+ 38%) mL之间的偏差。使用整年的年龄而不是十进制年龄会导致从-8% 到 + 7% 的偏差，而对身高的1% 高估会导致从 + 1% 到 + 40% 的偏差。偏见在儿童和青少年以及矮小的老年人中最大。使用适用于所有年龄和人群的单个肺活量测定方程可以减少预测偏差。如果要最小化偏差，准确测量和记录年龄和身高也是必不可少的。