scholarly journals Validation of a pre-coded food diary with energy expenditure, comparison of under-reporters v. acceptable reporters

2005 ◽  
Vol 94 (6) ◽  
pp. 998-1003 ◽  
Author(s):  
I. T. L. Lillegaard ◽  
L. F. Andersen
Keyword(s):  
Food Intake ◽  
Energy Expenditure ◽  
Pearson Correlation ◽  
Pearson Correlation Coefficient ◽  
Confidence Limits ◽  
Food Diary ◽  
Limits Of Agreement ◽  
Altman Plot ◽  
Bland Altman Plot ◽  
Males And Females

The objective of the present study was to compare energy intake (EI) assessed from a pre-coded food diary (PFD) with energy expenditure (EE) measured by a validated position-and-movement monitor (ActiReg®; PreMed AS, Oslo, Norway) in a group of Norwegian 9-year-olds. Moreover, we examined whether and how under-reporters (UR), identified with ActiReg®, differed from acceptable reporters (AR) according to food intake and BMI. A total of fifty-one 9-year-olds completed PFD and ActiReg®. The present study showed that on average EI was underestimated by 18 % compared with EE measured by ActiReg®. The 95 % confidence limits of agreement in a Bland–Altman plot for EI and EE varied from 1·97 MJ to −4·23 MJ (sd 2) among the girls and from 0·74 MJ to −5·26 MJ (sd 2) among the boys. The Pearson correlation coefficient between EI and EE was 0·28 (P=0·05) for males and females combined. Fifty-seven per cent of the participants were classified as AR, 39 % as UR and 4 % as over-reporters with the PFD. Under-reporting of energy remains a problem with the PFD method used in a group of 9-year-olds, especially among boys. However, UR and AR did not show a systematic misreporting related to macronutrients, unhealthy foods or BMI.

scholarly journals Validation of the Danish 7-day pre-coded food diary among adults: energy intake v. energy expenditure and recording length

2009 ◽  
Vol 102 (12) ◽  
pp. 1838-1846 ◽  
Author(s):  
Anja Biltoft-Jensen ◽  
Jeppe Matthiessen ◽  
Lone B. Rasmussen ◽  
Sisse Fagt ◽  
Margit V. Groth ◽  
...  
Keyword(s):  
Food Intake ◽  
Energy Expenditure ◽  
Energy Intake ◽  
Group Level ◽  
Food Diary ◽  
Dietary Survey ◽  
Limits Of Agreement ◽  
Free Living ◽  
Food Items ◽  
In The Beginning

Under-reporting of energy intake (EI) is a well-known problem when measuring dietary intake in free-living populations. The present study aimed at quantifying misreporting by comparing EI estimated from the Danish pre-coded food diary against energy expenditure (EE) measured with a validated position-and-motion instrument (ActiReg®). Further, the influence of recording length on EI:BMR, percentage consumers, the number of meal occasions and recorded food items per meal was examined. A total of 138 Danish volunteers aged 20–59 years wore the ActiReg® and recorded their food intake for 7 consecutive days. Data for 2504 participants from the National Dietary Survey 2000–2 were used for comparison of characteristics and recording length. The results showed that EI was underestimated by 12 % on average compared with EE measured by ActiReg® (PreMed AS, Oslo, Norway). The 95 % limits of agreement for EI and EE were − 6·29 and 3·09 MJ/d. Of the participants, 73 % were classified as acceptable reporters, 26 % as under-reporters and 1 % as over-reporters. EI:BMR was significantly lower on 1–3 consecutive recording days compared with 4–7 recording days (P < 0·03). Percentage consumers of selected food items increased with number of recording days. When recording length was 7 d, the number of reported food items per meal differed between acceptable reporters and under-reporters. EI:BMR was the same on 4 and 7 consecutive recording days. This was, however, a result of under-reporting in the beginning and the end of the 7 d reporting. Together, the results indicate that EI was underestimated at group level and that a 7 d recording is preferable to a 4 d recording period.

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.

Validation of a pre-coded food diary used among 13-year-olds: comparison of energy intake with energy expenditure

2005 ◽  
Vol 8 (8) ◽  
pp. 1315-1321 ◽  
Author(s):  
Lene F Andersen ◽  
Magnhild L Pollestad ◽  
David R Jacobs ◽  
Arne Løvø ◽  
Bo-Egil Hustvedt
Keyword(s):  
Food Intake ◽  
Energy Expenditure ◽  
Energy Intake ◽  
Pearson Correlation ◽  
Average Energy ◽  
Correlation Coefficients ◽  
Food Diary ◽  
Monitoring Period ◽  
Individual Level ◽  
Food Diaries

AbstractObjectiveTo validate energy intake (EI) estimated from pre-coded food diaries against energy expenditure (EE) measured with a validated position-and-movement monitor (ActiReg®) in groups of 13-year-old Norwegian schoolchildren.DesignTwo studies were conducted. In study 1 the monitoring period was 4 days; participants recorded their food intake for four consecutive weekdays using food diaries and wore the ActiReg® during the same period. In study 2 the monitoring period was 7 days; participants recorded their food intake for four consecutive days but wore the ActiReg® for a whole week.SettingsParticipants were recruited from grade 8 in a school in and one outside Oslo (Norway).SubjectsForty-one and 31 participants from study 1 and 2, respectively, completed the study.ResultsThe group average EI was 34% lower than the measured EE in study 1 and 24% lower in study 2. The width of the 95% confidence limits of agreement in a Bland–Altman plot for EI and EE varied from -0.2 MJ to 8.2 MJ in study 1 and from -2.3 MJ to 6.9 MJ in study 2. The Pearson correlation coefficients between reported energy intake and expenditure were 0.47 (P = 0.002) in study 1 and 0.74 (P < 0.001) in study 2.ConclusionThe data showed that there was substantial variability in the accuracy of the food diary at the individual level. Furthermore, the diary underestimated the average energy intake. The ability of the food diary to rank individuals according to energy intake was found to be good in one of the studies and moderate in the other.

scholarly journals Amyloid PET Quantification Using Low-dose CT-guided Anatomic Standardization

2021 ◽  
Author(s):  
Hiroshi Matsuda ◽  
Tensho Yamao ◽  
Mitsuru Shakado ◽  
Yoko Shigemoto ◽  
Kyoji Okita ◽  
...  
Keyword(s):  
Correlation Analysis ◽  
Low Dose ◽  
Pearson Correlation ◽  
Quantitative Measure ◽  
Amyloid Pet ◽  
Altman Plot ◽  
Ct Guided ◽  
Bland Altman Plot ◽  
Low Dose Ct ◽  
Pet Ct

Abstract BackgroundCentiloid (CL) scaling has become a standardized quantitative measure in amyloid PET because it facilitates the direct comparison of results across institutions, even when different analytical methods or tracers are used. Standard volumes of interest must be used to calculate the CL scale after the anatomic standardization of amyloid PET images using coregistered MRI; if the MRI is unavailable, the CL scale cannot be accurately calculated. This study sought to determine the substitutability of low-dose CT, which is used to correct PET attenuation in PET/CT equipment, by evaluating the measurement accuracy when low-dose CT is used as an alternative to MRI in the calculation of the CL scale. Amyloid PET images obtained using 18F-flutemetamol from 24 patients with possible or probable Alzheimer’s disease were processed to calculate the CL scale using 3D T1-weighted MRI and low-dose CT of PET/CT. CLMRI and CLCT were respectively defined as the use of MRI and CT for anatomic standardization and compared. Trial registration: Japan Registry of Clinical Trials, jRCTs031180321. Registered 18 March 2019, https://jrct.niph.go.jp/latest-detail/jRCTs031180321.ResultsA Bland–Altman plot showed that CLCT was slightly but significantly underestimated (mean ± standard deviation, −1.7 ± 2.4; p < 0.002) compared with CLMRI. The 95% limits of agreement ranged from −2.8 to −0.7. Pearson correlation analysis showed a highly significant correlation of r = 0.998 between CLCT and CLMRI (p < 0.001). The linear regression equation was CLMRI = 1.027 × CLCT + 0.762. In a Bland-Altman plot, Spearman correlation analysis did not identify a significant association between the CLMRI versus CLCT difference and the CL load (ρ = −0.389, p = 0.060). This slight underestimation of CLCT may derive from slightly higher uptake when the cerebellum is used as a reference area in CT-based anatomically standardized PET images versus MRI-based images.ConclusionsLow-dose CT of PET/CT can substitute for MRI in the anatomic standardization used to calculate the CL scale from amyloid PET, although a slight underestimation occurs.

scholarly journals Artificial intelligence system can achieve comparable results to experts for bone age assessment of Chinese children with abnormal growth and development

PeerJ ◽  
2020 ◽  
Vol 8 ◽  
pp. e8854
Author(s):  
Fengdan Wang ◽  
Xiao Gu ◽  
Shi Chen ◽  
Yongliang Liu ◽  
Qing Shen ◽  
...  
Keyword(s):  
Artificial Intelligence ◽  
Growth And Development ◽  
Bone Age ◽  
Chinese Children ◽  
Absolute Difference ◽  
Reference Standard ◽  
Limits Of Agreement ◽  
Altman Plot ◽  
Bland Altman Plot ◽  
Abnormal Growth

Objective Bone age (BA) is a crucial indicator for revealing the growth and development of children. This study tested the performance of a fully automated artificial intelligence (AI) system for BA assessment of Chinese children with abnormal growth and development. Materials and Methods A fully automated AI system based on the Greulich and Pyle (GP) method was developed for Chinese children by using 8,000 BA radiographs from five medical centers nationwide in China. Then, a total of 745 cases (360 boys and 385 girls) with abnormal growth and development from another tertiary medical center of north China were consecutively collected between January and October 2018 to test the system. The reference standard was defined as the result interpreted by two experienced reviewers (a radiologist with 10 years and an endocrinologist with 15 years of experience in BA reading) through consensus using the GP atlas. BA accuracy within 1 year, root mean square error (RMSE), mean absolute difference (MAD), and 95% limits of agreement according to the Bland-Altman plot were statistically calculated. Results For Chinese pediatric patients with abnormal growth and development, the accuracy of this new automated AI system within 1 year was 84.60% as compared to the reference standard, with the highest percentage of 89.45% in the 12- to 18-year group. The RMSE, MAD, and 95% limits of agreement of the AI system were 0.76 years, 0.58 years, and −1.547 to 1.428, respectively, according to the Bland-Altman plot. The largest difference between the AI and experts’ BA result was noted for patients of short stature with bone deformities, severe osteomalacia, or different rates of maturation of the carpals and phalanges. Conclusions The developed automated AI system could achieve comparable BA results to experienced reviewers for Chinese children with abnormal growth and development.

scholarly journals Correlation of Corneal Thickness Measurements Between Tono-pachymeter and Scheimpflug- Placido Topography

2021 ◽  
Vol 16 (2) ◽  
pp. 161-167
Author(s):  
Zeynep Eylül Ercan ◽  
Keyword(s):  
Corneal Thickness ◽  
Age Groups ◽  
Limits Of Agreement ◽  
Altman Plot ◽  
Bland Altman Plot ◽  
Significant Relationships ◽  
Plot Analysis ◽  
Group 2 ◽  
Thickness Measurements ◽  
Group 1

Central corneal thickness (CCT) measurements are important for diagnosis, treatment, and surgery planning in ophthalmology. The purpose of this study was to see whether CCT measurements taken with Tono-pachymeter and Scheimpflug- Placido Topography had any significant differences. Tono-pachymeter and topography CCT measurements were taken (n=400). Inter-measurement agreement between them was determined using Bland-Altman Plot analysis. Age groups were also formed as group 1 (aged 18-50 years, 94 males, 106 females) and group 2 (age >51 years, 100 males, 100 females). Mean CCTs measured by Tonopachymeter and topography were 563.77 +±26.43 and 560.88 + 26.341 microns. Bland-Altman Plot analysis showed in total, 13 were above the upper limit and 5 were under the minimum limit of agreement with regression analysis showing no significant relationships (p=0.213). Group 1 had 7 above and 2 below from the limits of agreement. Group two had 9 above and 2 below from the limits of agreement. Both groups showed insignificant differences between devices (p=0.07 and p=0.86). Tono-pachymeter and Scheimpflug-Placido Topography give reliable CCT results within each other. However, since the limit of agreement ranges can still affect one-to-one patient evaluations, we recommend clinics that use these devices to not interchange measurements in practice.

Evaluating the agreement between the empirical volumes of tumor lesions and the estimated volumes of tumor lesions based on the longest diameter.

2012 ◽  
Vol 30 (4_suppl) ◽  
pp. 635-635 ◽  
Author(s):  
Ruediger P. Laubender ◽  
Michael Schlichting ◽  
Ute Sartorius ◽  
Dominik Paul Modest ◽  
Ulrich Robert Mansmann ◽  
...  
Keyword(s):  
Tumor Volume ◽  
Three Dimensional ◽  
Disease Process ◽  
Volume Data ◽  
Limits Of Agreement ◽  
Altman Plot ◽  
Bland Altman Plot ◽  
Volume Measurements ◽  
Colorectal Cancer Patients ◽  
The Impact

635 Background: Tumor lesions are commonly evaluated by RECIST or WHO criteria, which involves reducing the development of a three-dimensional tumor to a two-dimensional process. However, volume measurements might reflect the clinical impact of the disease process more precisely. Therefore, we investigated if the volume of a tumor lesion can be reconstructed from RECIST- or WHO-based measurements. Methods: 20 colorectal cancer patients underwent routine staging MDCT examinations as part of the multicenter phase II CIOX trial comparing cetuximab + XELOX versus cetuximab + XELIRI. Two hepatic target lesions per patient were defined at baseline and measured using 1) semi-automated volumetry (Siemens Syngo Via Oncology, Siemens Healthcare) with manual correction and 2) semi-automated measurement of the longest diameter (LD) according to RECIST 1.1 and the corresponding longest orthogonal diameter (LOD). Patient lesions were followed over time using the same measurement strategies. An algorithm was developed for reconstructing the volume of a lesion based on the LD and the corresponding LOD. Agreement of the volume data generated by both methods was analyzed by a Bland-Altman plot. The limits of agreements were calculated using a variance components model considering repeated tumor assessments based on the log-transformed sum over the volume of a patient’s lesions. Results: 151 lesions from the 20 patients were measured at 73 tumor assessments. Volume was slightly overestimated by the algorithm compared to the volumetric measurements (p = 0.07). The Bland-Altman plot showed good agreement (mean difference −0.05, limits of agreement [−0.40, 0.30]). As expected, three out of the 73 measurements fell outside the limits of agreement. Conclusions: The proposed algorithm for the WHO-based reconstruction of the tumor volume provides a good approximation to the true sum of the volumes of the lesions. In future studies, volumetric tumor information can be included even if not all centers have full volumetric software available. This enables further research on the impact of changes in tumor volume on disease prognosis and/or prediction of treatment efficacy.

scholarly journals Correlation and agreement between superb micro-vascular imaging and contrast-enhanced ultrasound for assessing radiofrequency ablation treatment of thyroid nodules: a preliminary study

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Yu Lan ◽  
Nan Li ◽  
Qing Song ◽  
Ming-bo Zhang ◽  
Yu-kun Luo ◽  
...  
Keyword(s):  
Volume Measurement ◽  
Vascular Imaging ◽  
Scatter Plot ◽  
Limits Of Agreement ◽  
Altman Plot ◽  
Bland Altman Plot ◽  
Observer Reliability ◽  
Contrast Enhanced ◽  
Good Agreement

Abstract Background To evaluate the correlation and agreement between superb micro-vascular imaging (SMI) mode and the contrast-enhanced ultrasound (CEUS) mode for the ablative completeness and the volumes of ablation lesions to determine the clinical application value of SMI in follow-up after radiofrequency ablation. Methods From April 2020 to June 2020, two radiologists used SMI and CEUS mode to measure the volume of the ablation lesion. We use intra-class correlation coefficient (ICC), scatter plots and Bland–Altman plots to evaluate the correlation and agreement of the two techniques. In addition, intra- and inter-observer reliability in volume measurement of ablation lesions with SMI mode was assessed. Results SMI mode and CEUS mode have good agreement in the evaluation of ablative completeness. The ICC was 0.876 and 0.928 of reader A and reader B between SMI mode and CEUS mode in terms of ablation lesions volume measurement. There was a strong correlation between the two modes in both reader A and reader B (rA = 0.808; rB = 0.882). The ICC was 0.836 for the inter-observer reliability of SMI technique. The scatter plot showed a good linear relation (r = 0.715). In the Bland–Altman plot, 4.35% (1/23) of the points was outside the 95% limits of agreement. The ICC was 0.965 for the intra-observer reliability of SMI technique, the scatter plot also showed a strong linear correlation (r = 0.965). In the Bland–Altman plot, 8.70% (2/23) of the points was outside the 95% limits of agreement. Conclusions SMI and CEUS have good agreement and correlation in the ablation volume measurement. SMI technology is expected to be applied as an alternative to CEUS in the clinical follow-up of ablation lesions.

P1522Validating a new device for precise assessment of pulse wave velocity in arteries of various structures in patients in different age groups

2019 ◽  
Vol 40 (Supplement_1) ◽  
Author(s):  
R Olszewski ◽  
T Sondej ◽  
K Sieczkowski ◽  
K Obiala ◽  
I Jannasz ◽  
...  
Keyword(s):  
Arterial Stiffness ◽  
Pulse Wave Velocity ◽  
Wave Velocity ◽  
Pulse Wave ◽  
Pearson Correlation ◽  
Age Groups ◽  
Altman Plot ◽  
Bland Altman Plot ◽  
New Device ◽  
The Difference

Abstract Background Arterial stiffness (AS) is a process that develops with age and obesity, but is also an independent predictive factor for the development of hypertension, and cardiovascular complications. Measuring the pulse wave velocity (PWV) is the most common method of assessing arterial stiffness. Two methods of PWV evaluation dominate in the world (carotid-femoral and brachial-ankle). However, recent studies have indicated that the age-related increase in PWV was not even uniform in different arteries and the AS gradient is a better predictor of mortality than the classic PWV one. So we need the devices for a more accurate assessment of AS in different areas. Our group constructed a precise, multi-site system (M3S) for the simultaneous, real-time, synchronous measurement of PWV. M3S has a maximum of eight photopletysmographic (PPG) detectors – Fig. 1A. Aim The purpose of the study is to validate the PWV measurement by M3S device against a gold standard (SphygmoCor XCEL) for patients in different age groups. Methods Measurements collected from 62 subjects (36 young [19–24], 26 older [62–89]) using the M3S were compared with simultaneously recorded SphygmoCor XCEL measurements. With the 59 paired PWV values, we investigated the agreement between the M3S prototype and the SphygmoCor XCEL device using Pearson correlation analysis and Bland-Altman plot. We also performed analysis on the determinants and reproducibility of PWV measured with both devices. Results The correlation coefficient for PWV measured with the two devices was 0.87 (p<0.001) – Fig. 1B. Compared with the SphygmoCor XCEL device, the M3S prototype slightly underestimated PWV by r=−0.47 m/s (±1.96 standard deviations SD: +2.2 m/s, r=−3.2 m/s). The coefficient of variation (CV) between the difference and the average of the M3S and SphygmoCor XCEL measurements was 19% (p=0.10) – Fig. 1C. Figure 1. A. Block diagram of M3S measurement system with configuration for PWV validation. B. Relationship between PWV for SphygmoCor XCEL (carotid-femoral) and M3S (forehead-toes (right, left mean). C. Bland-Altman plot for the analysis of the difference between the SphygmoCor XCEL and M3S devices. Conclusion This technique used by the M3S could provided a multi-site measurement of PWV. It can be potentially extended for measurement and non-invasive characterization of global arterial stiffness with the possibility of calculating the different AS gradients.

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