Level of agreement between sPRO and Kubios software in the analysis of R-R intervals obtained by a chest strap

2021 ◽  
pp. 175433712110311
Author(s):  
José Pino-Ortega ◽  
Markel Rico-González ◽  
Petrus Gantois ◽  
Fabio Y Nakamura
Keyword(s):  
Time Domain ◽  
Time Course ◽  
Intraclass Correlation ◽  
Systematic Bias ◽  
Altman Plot ◽  
Bland Altman Plot ◽  
Software Packages ◽  
The Mean ◽  
Improved Performance ◽  
Level Of Agreement

Heart rate variability (HRV) is becoming one of the most commonly used tools for tracking the time course of training adaptation/maladaptation of athletes and setting optimal training loads, leading to improved performance. The aim of this study was to compare Realtrack Systems manufacturer software (sPRO) with the Kubios HRV Standard. R-R intervals were recorded from 48 athletes using a chest strap synchronized to WIMU PRO™ device for 10 min to analyze time-domain HRV indices, located between the scapulae. Time-domain HRV indices analyzed included the square root of the mean squared differences of successive R-R intervals (RMSSD), standard deviation of normal R-R intervals (SDNN), and percentage of adjacent R-R intervals that differ from each other by more than 50 ms (pNN50). The intraclass correlation test and Bland-Altman plot were used to verify the agreement between the sPRO and the Kubios HRV Standard software for examining time-domain HRV indices. The intraclass correlation coefficient showed high values of agreement of R-R intervals and time-domain HRV indices between the two software options (RMSSD, SDNN, and pNN50; ICC > 0.951). The Bland-Altman plot showed low bias for all the HRV indices analyzed (bias = −0.11 to −1.08). In addition, no systematic bias was found between the residual of the mean difference and the average values of the two software packages ( p > 0.05). Therefore, both software options can be used interchangeably for analyzing time-domain HRV records.

scholarly journals Do the Readings of Digital and Aneroid Sphygmomanometer Concur? A Clinic-Based Study in an Urban Area of South Kolkata

2021 ◽  
Author(s):  
Aparajita Dasgupta ◽  
Foulisa Pyrbot ◽  
Bobby Paul ◽  
Soumit Roy ◽  
Pritam Ghosh ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Blood Pressure Measurement ◽  
Intraclass Correlation ◽  
Research Work ◽  
P Value ◽  
Altman Plot ◽  
Cohen’S Kappa ◽  
Predictive Values ◽  
Bland Altman Plot ◽  
Cohen's Kappa

Introduction: Hypertension is a major risk factor for cardiovascular and cerebrovascular diseases. Thus, regular and accurate measurement of Blood Pressure (BP) is essential for its early diagnosis and follow-up. There is a surge in popularity of digital sphygmomanometer due to its convenience of use and functionality. In contrast, the traditional universally accepted sphygmomanometer is aneroid type, hence there arise a need for comparison of digital and universally accepted Aneroid Sphygmomanometer in terms of agreement and correlation. Aim: To evaluate the agreement and correlation between blood pressure measurement by digital and aneroid sphygmomanometer. Materials and Methods: The clinic based cross-sectional study was conducted in the Out Patient Department (OPD) of Urban Heath Centre, All India Institute of Hygiene and Public Health, Kolkata, West Bengal, India. Adults visiting the OPD on two chosen days of the week, between June 2019 to July 2019 were selected using systematic random sampling. A total of 400 participants were included. Agreement and correlation between BP measurements by digital and aneroid sphygmomanometer was analysed by Cohen’s Kappa, Bland Altman Plot along with sensitivity, specificity and predictive values using Microsoft Excel and Statistical Package for the Social Sciences (SPSS) version 16.0. the p-value <0.05 was considered significant for the statistical test in the analysis. Results: Cohen’s Kappa value (0.59) revealed these two tools had moderate agreement in diagnosing hypertension. Sensitivity and specificity of digital sphygmomanometer taking aneroid sphygmomanometer as gold standard is 86% and 83.1% respectively. The BP readings of these two-tools showed moderate correlation as Intraclass Correlation Coefficient (ICC) for Systolic BP (SBP) and Diastolic BP (DBP) were 0.804 and 0.624, respectively. Bland Altman plot showed gross disagreement of SBP findings and disagreement between DBP findings was also noted. Conclusion: Digital device was found to be less accurate in detecting hypertension. Therefore, more similar research work is solicited to verify the accuracy of the very easy to use, the Digital BP monitor.

scholarly journals Comparisons of Five Equations Used for Estimating the Glomerular Filtrations Rate in Chinese Adults

2020 ◽  
Author(s):  
shuai fu ◽  
Min Yang ◽  
Si Xu ◽  
Sha Wu ◽  
Xiao Xiao ◽  
...  
Keyword(s):  
Intraclass Correlation ◽  
Roc Curves ◽  
Severely Injured ◽  
Chinese Adults ◽  
Altman Plot ◽  
Bland Altman Plot ◽  
Chinese Adult ◽  
Blood Biochemical ◽  
Hospitalised Patients ◽  
Kappa Value

Abstract Background We aimed to assess the performance of revised MDRD, CKD-EPI, BIS, FAS and XiangYa equation in Chinese adults Methods We collected blood biochemical data of 623 chinese adult hospitalised patients within 48 hours before they underwent 99m Tc-DTPA GFR measurement. We computed the bias (mGFR-eGFR), the precision (IQR) ,the accuray (P30）and root mean square error (RMSE) relative to mGFR of each equation to evaluate performance. The ROC curves, Kappa value of McNemar test, Bland-Altman plot and the Intraclass correlation coefficient (ICC) were used to evaluate diagnostic accuracy and concordance. Results Totally, the FAS combined Scr and cysC equation performed supreme accuracy(P30=57.5%, RMSE=19.26), the cysC-based equation performed superior to Scr-based equation. Detailed P30 of the CKD-EPI cysC , FAS cysC , MDRD, CKD-EPI Scr-cysC , CKD-EPI Scr , FAS Scr , XiangYa was 56.7%, 56.0%, 53.5%, 52.2%, 48.8%, 51.4%, 43.0%. The CKD-EPI cysC equation showed the lowest bias and the highest accuracy(bias=-2.23, P30=57.4%) in GFR<60ml/min/1.73m 2 , followed by the FASscr-cysC equation(bias=-6.89, P30=55.4%). The XiangYa equation perfomed best in GFR≥60ml/min/1.73m 2 while worst in GFR<60 ml/min/1.73m 2 with bias(-5.79 vs -19.05), IQR(18.21 vs 10.85), P30(86.2% vs 21.1%), RMSE(16.68 vs 21.34). The CKD-EPI cysC equation had the lowest bias and the best accuracy(bias=-2.23, P30=59.4%) in age ≥70 years adults, followed by the FAS Scr-cysC equation equivalented to BIS-2 Scr-cysC equation(bias -5.33 vs -4.90, P30=57.3%), while the XiangYa equation performed worstly (bias=-20.39, P30=26.6%). Best ROC AUC was gaven by the FAS Scr-cysC equation(0.951),so was it had the highest Kappa value(0.364). The lowest Bias showed in Bland-Altman plot was the CKD-EPI cysC equation(bias=7.46). The highest ICC value was gaven by the FAS Scr-cysC equation(0.921). Secondly, it was the XiangYa equation with the ICC of 0.912. Conclusions The FAS Scr-cysC equation is verified most suitable and simpler applied to Chinese population. The CKD-EPI cysC equation is appropriate used in moderately and severely injured GFR(CKD3-5stage) and Seniors over 70 years old. The XiangYa equation performed perfectly in slightly injured GFR (CKD1-2stage), while further verification of XiangYa equation in multiple region need to carried out especially in moderately and severely injured GFR and older adults.

Effect of manual eyelid manipulation on intraocular pressure measurement by rebound tonometry

2018 ◽  
Vol 102 (11) ◽  
pp. 1515-1519 ◽  
Author(s):  
Sung Uk Baek ◽  
Ahnul Ha ◽  
Young Kook Kim ◽  
Jin Wook Jeoung ◽  
Ki Ho Park
Keyword(s):  
Intraocular Pressure ◽  
Primary Open Angle Glaucoma ◽  
Open Angle Glaucoma ◽  
Mean Value ◽  
Applanation Tonometry ◽  
Palpebral Fissure ◽  
Altman Plot ◽  
Bland Altman Plot ◽  
Rebound Tonometry ◽  
The Mean

Background/aimsTo investigate the effect of eyelid manipulation on the measurement of intraocular pressure (IOP) using two different tonometries (rebound tonometry (RT) vs Goldmann applanation tonometry (GAT)).Methods103 patients with primary open-angle glaucoma were prospectively enrolled. For all of the patients, IOP measurements were performed in three different ways: (1) RT with lid manipulation (LM), (2) RT without LM and (3) GAT. The order of the three measurements was randomly selected. Additionally, the palpebral fissure height (PFH; elliptical space between upper and lower eyelids) was measured.ResultsThe mean value of IOP measured by GAT was 13.97±2.80 mm Hg, which was not significantly different from that by RT without LM (13.75±2.44 mm Hg; P=0.096), but which was significantly lower than that by RT with LM (15.21±2.91 mm Hg; P<0.001). On a Bland-Altman plot, RT with LM was overestimated relative to GAT (mean: −1.5) and RT without LM (mean: −1.2). Among the high IOPs (>20 mm Hg), interestingly, those measured by RT without LM were significantly lower than those measured by GAT (P<0.001). In the subgroup analysis of PFH, the smaller the PFH, the more exaggerated the IOP difference between GAT (P=0.014) and RT with LM (P<0.001).ConclusionRT-measured IOP was significantly exaggerated when manipulation was applied to the eyelid. This overall trend was more pronounced when PFH was small. GAT-measured IOP, meanwhile, showed a good correlation with IOP measured using RT without LM.

scholarly journals A Comparative Study of the Saltzman and the Modified Long-leg Radiograph for Assessing Hindfoot Alignment

2017 ◽  
Vol 2 (3) ◽  
pp. 2473011417S0003
Author(s):  
Kalpesh Shah ◽  
Kumar Kaushik Dash
Keyword(s):  
Correlation Coefficient ◽  
Intraclass Correlation Coefficient ◽  
Knee Replacement ◽  
Lower Limb ◽  
Intraclass Correlation ◽  
Limb Length Discrepancy ◽  
Altman Plot ◽  
Linear Distribution ◽  
Hindfoot Alignment ◽  
Bland Altman Plot

Category: Radiology Introduction/Purpose: There is growing evidence suggesting that the alignment of the leg (hip-knee-ankle or HKA axis) should be considered when planning an ankle replacement and alignment of the hindfoot (tibio-calcaneal or TC axis) should be considered when planning a knee replacement. The alignment of the HKA axis is assessed from standard long-leg radiographs, while the hindfoot alignment requires special views like Saltzman’s or Coetzee’s or similar. However we have discovered that by making minor adjustments to the way a standard long-leg radiograph is taken, it is possible to measure both the HKA as well as the TC axis from the same radiograph. The aim of our study was to compare the hindfoot alignment between a Saltzman’s view and the modified long-leg view. Methods: Approval was obtained for a prospective observational study on 65 consecutive patients referred to our hospital for a knee replacement. Patients with multiple joint arthritis, previous lower-limb surgery, or limb length discrepancy requiring shoe- raise were excluded. All patients had a preoperative modified long-leg view as part of our routine for radiographic assessment of a knee replacement; as well as a Saltzman’s view which served as a standard for hindfoot alignment. The long-leg alignment was measured using the standard HKA (hip-knee-ankle) axis, and the alignment of the hindfoot (tibio-calcaneal angle) was measured using the method described by Van Dijk et all. A difference of 3 degrees between the two observations was agreed to be considered as significant. Results were recorded by two Surgeons independently and analysed using the Bland-Altman Plot. The Intraclass Correlation Coefficient was used for inter-observer variation. Results: 48 patients were eligible for the study. The hindfoot angle measured in the modified long-leg view (mean 9.29 degrees, SD 4.26 degrees) was similar to that in the Saltzman’s view (mean 8.99 degrees, SD 4.16 degrees). The Scatter Plot showed a linear distribution, with Spearmann Correlation Coefficient of 0.892. Bland Altman Plot showed the differences in the measurements residing within the agreed difference of 3 degrees. Intraclass Correlation Coefficient was 0.94 for the modified long-leg view and 0.87 for the Saltzman’s view, suggesting excellent interobserver agreement. Conclusion: Our study shows that the position of the hindfoot can be reliably measured from the modified long-leg view, and this removes the need for additional radiographs for hindfoot alignment. As the entire femur, tibia and the hindfoot is accessible in the same long-leg view, this creates a platform for further research in to the mechanical axis of the entire lower limb as opposed to the HKA axis, and the effects of malalignment of the lower extremity in patients undergoing knee or ankle replacements.

scholarly journals 07 Examination of Reliability and Validity of Index of Postural Stability for Patients with Neurological Diseases

2019 ◽  
Vol 48 (Supplement_4) ◽  
pp. iv1-iv2
Author(s):  
Hisashi Mochizuki
Keyword(s):  
Neurological Disease ◽  
Postural Stability ◽  
Neurological Diseases ◽  
Intraclass Correlation ◽  
Reliability And Validity ◽  
Minimal Detectable Change ◽  
Altman Plot ◽  
Bland Altman Plot ◽  
Functional Reach Test ◽  
Balance Ability

Abstract Purpose The purpose of this study was to examine the reliability and validity of the Index of Postural Stability for patients with neurological disease. Methods The Index of postural stability (IPS) is a logarithmic value of the ratio between the stability limit and the area of centre of pressure (COP) in standing position, and is based on a probabilistic idea. Subjects were 75 patients with neurological disease (mean age; 63±12 years, 47 with Parkinson's disease, 9 with multiple sclerosis, 8 with Parkinsonism and others 11). Balance ability of subjects were assessed using IPS, Berg balance scale (BBS), Timed Up and Go Test(TUG), Functional Reach Test(FR), and gait ability of subjects were assessed using Functional Gait Category(FAC). IPS was assessed twice at intervals of about 30 minutes. Reliability of IPS was examined using Intraclass correlation coefficient (ICC), Bland-Altman plot and minimal detectable change (MDC). Validity of IPS was examined using correlation coefficients with BBS, TUG, FRT, and FAC. Results IPS showed significant and moderate correlation with BBS (r = 0.54), FR (r = 0.36), TUG (r =-0.43). IPS and FAC showed strong correlation (rs= 0.64). ICC of 2 separate measurements was 0.96. From the results of Bland-Altman plot, IPS had no additional error or proportional error (95%CI:-0.048~0.034, r=-0.0088, p=0.94). The MDC of IPS was 0.34. Discussion Since IPS has high reproducibility and does not have additional errors or proportional errors, and is also significantly related to other evaluation indexes of balance ability, it is considered that IPS may be a useful evaluation index of balance ability for patients with neurological diseases.

Reliability of Shoulder Symptom Recall after 1 Year in a Retrospective Application of the Oxford Shoulder Score

2012 ◽  
Vol 4 (4) ◽  
pp. 255-258
Author(s):  
Michael Held ◽  
Steve Roche ◽  
Basil Vrettos ◽  
Maritz Laubscher ◽  
Johan Walters
Keyword(s):  
Shoulder Function ◽  
Test Pair ◽  
Altman Plot ◽  
Bland Altman Plot ◽  
Individual Level ◽  
Oxford Shoulder Score ◽  
The Mean ◽  
One Year ◽  
The Individual ◽  
Shoulder Score

Background The accuracy of retrospective recall of shoulder symptoms has not been well documented. This prospective study assesses the ability of patients to recall their preoperative shoulder function one year after a surgical intervention, using the Oxford Shoulder Score (OSS). Methods 35 patients completed an OSS before undergoing shoulder surgery. One year later, patients were asked to recall their symptoms prior to their surgery. The recalled OSS of the patients as a group was compared to their preoperative score. The recall bias of each test pair was assessed with a Bland – Altman plot. Results On recall after a mean of 12.6 months, the mean OSS from the index assessment increased from 36.25 to 38.25 points. The mean difference of 2 points for the patients as a group was not significant (p = 0.14). The statistical limits of agreement of the Bland – Altman plot were set at +/-2 SD = 14.079 points. The plotted points showed fair correlation between each individual test pair. Conclusion The recall of symptoms of a large group of patients at 1 year after the index intervention appears to have a moderate correlation with the preoperative scoring. Although statistically acceptable, this limit of agreement is much larger than the 4.5-point difference, established to be clinically relevant in prior studies. The variation seen within the scores at the individual level suggests that these data cannot be used as a retrospective tool.

scholarly journals Original article. Repeatability assessment of the New Numbers Contrast Sensitivity Chart

2014 ◽  
Vol 8 (3) ◽  
pp. 361-369
Author(s):  
Bharkbhum Khambhiphant ◽  
Sunee Chansangpetch ◽  
Wasee Tulvatana ◽  
Mathu Busayarat
Keyword(s):  
Contrast Sensitivity ◽  
Narrow Range ◽  
Primary Language ◽  
Altman Plot ◽  
Bland Altman Plot ◽  
Plot Analysis ◽  
Good Repeatability ◽  
The Mean ◽  
Mean Differences ◽  
The Right

Abstract Background: The validity and agreement of the New Numbers Contrast Sensitivity Chart with the original Mars chart have been found to be good. The two charts can be used interchangeably; however, evidence of the repeatability of the new chart remains to be sought. This study was to assess the repeatability of the New Numbers Contrast Sensitivity Chart. Objectives: We assessed the repeatability of the Numbers Contrast Sensitivity Chart. Methods: Two hundred subjects from the ophthalmic clinic of the King Chulalongkorn Memorial Hospital, who were able to communicate and read Arabic numerals were recruited. The contrast sensitivity (CS) scores were collected by reading the same Numbers Contrast Sensitivity Chart in the same environment with each eye and both eyes ten minutes apart. The repeatability of the CS score was assessed by Bland-Altman plot analysis. Results: The visual acuity of subjects with variety in diagnoses ranged from 20/480 to 20/20. The mean differences were -0.006, -0.008, -0.002 log CS and the coefficients of repeatability were 0.155, 0.141, and 0.093 for the right eye, left eye, and both eyes, respectively. The plots showed a narrow range of 95% limit of agreement, which were (+0.146, -0.159) in the right eye, (+0.130, -0.147) in the left eye, and (+0.089, -0.093) in both eyes. Conclusions: The New Numbers Contrast Sensitivity Chart has good repeatability. With proven good validity and repeatability, this easy and convenient numbers chart is beneficial for practical use in a clinical setting where English is not used as the primary language.

Evaluation of a New Chromogenic Medium for Direct Enumeration of Campylobacter in Poultry Meat Samples

2014 ◽  
Vol 77 (12) ◽  
pp. 2111-2114 ◽  
Author(s):  
TOMASZ SELIWIORSTOW ◽  
JULIE BARÉ ◽  
BAVO VERHAEGEN ◽  
MIEKE UYTTENDAELE ◽  
LIEVEN DE ZUTTER
Keyword(s):  
Poultry Meat ◽  
Concordance Correlation Coefficient ◽  
Concordance Correlation ◽  
Altman Plot ◽  
Chromogenic Medium ◽  
Bland Altman Plot ◽  
Selective Media ◽  
Meat Samples ◽  
High Level ◽  
Level Of Agreement

The present study was conducted to compare Campylobacter counts obtained by three selective media: modified charcoal cefoperazonedeoxycholate agar (mCCDA), Campy Food agar (CFA), and a novel agar RAPID'Campylobacter agar. Analysis of 12 artificially and 36 naturally contaminated samples indicated no significant differences in Campylobacter counts obtained with all three selective media. Lin's concordance correlation coefficient (CCC) and the Bland-Altman plot revealed a high level of agreement between Campylobacter counts when evaluating RAPID versus mCCDA and CFA plates. RAPID agar was the only medium tested that could effectively suppress the growth of the background microflora with naturally contaminated samples. Results of this study clearly indicated that RAPID agar is highly selective without loss of sensitivity for recovering Campylobacter. Results obtained are in agreement with those for other commonly used media; therefore, RAPID medium is suitable for Campylobacter enumeration in poultry meat samples.

Comparing face-to-face and videoconference completion of the Montreal Cognitive Assessment (MoCA) in community-based survivors of stroke

2019 ◽  
pp. 1357633X1989078 ◽  
Author(s):  
Jodie E Chapman ◽  
Dominique A Cadilhac ◽  
Betina Gardner ◽  
Jennie Ponsford ◽  
Ruchi Bhalla ◽  
...  
Keyword(s):  
Repeated Measures ◽  
Cognitive Assessment ◽  
Intraclass Correlation ◽  
Screening Tools ◽  
Montreal Cognitive Assessment ◽  
Cognitive Screening ◽  
Community Based ◽  
Altman Plot ◽  
Bland Altman Plot ◽  
Face To Face

Introduction Videoconferencing may help address barriers associated with poor access to post-stroke cognitive screening. However, the equivalence of videoconference and face-to-face administrations of appropriate cognitive screening tools needs to be established. We compared face-to-face and videoconference administrations of the Montreal Cognitive Assessment (MoCA) in community-based survivors of stroke. We also evaluated whether participant characteristics (e.g. age) influenced equivalence. Methods We used a randomised crossover design (two-week interval). Participants were recruited through community advertising and use of a stroke-specific database. Both sessions were conducted by the same researcher in the same location. Videoconference sessions were conducted using Zoom. A repeated-measures t-test, intraclass correlation coefficient (ICC), Bland–Altman plot and multivariate regression modelling were used to establish equivalence. Results Forty-eight participants (26 men, Mage = 64.6 years, standard deviation ( SD) = 10.1; Mtime since stroke = 5.2 years, SD = 4.0) completed the MoCA face-to-face and via videoconference on average 15.8 ( SD = 9.7) days apart. Participants did not perform systematically better in a particular condition, and no participant variable predicted difference in MoCA performance. However, the ICC was low (0.615), and the Bland–Altman plot indicated wide limits of agreement, indicating variability between sessions. Discussion Our findings provide preliminary evidence to support the use of videoconference to administer the MoCA following stroke. However, further research into the test–retest reliability of scores derived from the MoCA is needed in this population. Administering the MoCA via videoconference holds potential to ensure that all stroke survivors undergo cognitive screening, in line with recommended clinical practice.

Cervical length at 31–34 weeks of gestation: transvaginal vs. transperineal ultrasonographic approach

2019 ◽  
Vol 47 (8) ◽  
pp. 817-821 ◽  
Author(s):  
Ioannis Tsakiridis ◽  
Themistoklis Dagklis ◽  
Apostolos Mamopoulos ◽  
Angeliki Gerede ◽  
Apostolos Athanasiadis
Keyword(s):  
Correlation Coefficient ◽  
Pearson Correlation ◽  
Close Correlation ◽  
Cervical Length ◽  
Tolerance Interval ◽  
Pearson Correlation Coefficient ◽  
Altman Plot ◽  
Bland Altman Plot ◽  
Paired Samples ◽  
The Mean

Abstract Objectives To investigate the correlation between transperineal (TP) and transvaginal (TV) ultrasonography in the measurement of cervical length (CL) in the third trimester of pregnancy. Methods In this prospective study, CL measurements were conducted in women between 31 and 34 weeks of gestation by both the TP and TV approaches. A comparison of the measurements was made between the two techniques. The Pearson correlation coefficient, the paired samples t-test and Bland-Altman plot were used. Results In total, 240 women participated in the study. The CL was successfully measured transvaginally in all cases and transperineally in 229 (95.4%) of the cases. The mean TV CL was 32.8 ± 8.2 mm and the mean TP CL was 32.5 ± 8.1 mm. In the 229 cases with paired measurements, the Pearson correlation coefficient was 0.964. No significant differences in mean CL were identified between the two methods (t = 1.805; P = 0.072). In the Bland-Altman plot, the difference between the paired means was 0.26 mm and the 95% tolerance interval for any given paired observation (TV CL–TP CL) was −4.05 to 4.57 mm. Conclusion The findings of this study suggest that at 31–34 weeks of gestation the cervix can be visualized adequately by both the TV and TP sonography in about 95% of cases. The TP CL measurements demonstrate a close correlation with the TV measurements. TP ultrasound is a feasible alternative, especially in cases where the use of the vaginal transducer should be minimized or is not acceptable by women.

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