The Experts below are selected from a list of 111 Experts worldwide ranked by ideXlab platform

M. Zelter - One of the best experts on this subject based on the ideXlab platform.

  • All-age relationship between arm Span and Height in different ethnic groups
    The European respiratory journal, 2014
    Co-Authors: Philip H. Quanjer, André Capderou, M. Mümtaz Mazıcıoğlu, Ashutosh N. Aggarwal, Sudip Datta Banik, Stevo Popovic, Francis A. Tayie, Mohammad Golshan, M. Zelter
    Abstract:

    The objective of the present study was to establish multiethnic, all-age prediction equations for estimating stature from arm Span in males and females. The arm Span/Height ratio (ASHR) from 13 947 subjects (40.9% females), aged 5-99 years, from nine centres (in China, Europe, Ghana, India and Iran) was used to predict ASHR as a function of age using the lambda, mu and sigma method. Z-scores for forced expiratory volume in 1 s (FEV1), forced vital capacity (FVC) and FEV1/FVC in 1503 patients were calculated using measured Height and Height calculated from arm Span and age. ASHR varied nonlinearly with age, was higher in males than in females and differed significantly between the nine sites. The data clustered into four groups: Asia, Europe, Ghana and Iran. Average predicted FEV1, FVC and FEV1/FVC using measured or predicted Height did not differ, with standard deviations of 4.6% for FEV1, 5.0% for FVC and 0.3% for FEV1/FVC. The percentages of disparate findings for a low FEV1, FVC and FEV1/FVC in patients, calculated using measured or predicted Height, were 4.2%, 3.2% and 0.4%, respectively; for a restrictive pattern, there were 1.0% disparate findings. Group- and sex-specific equations for estimating Height from arm Span and age to derive predicted values for spirometry are clinically useful.

  • Reconsidering the arm Span-Height relationship in patients referred for spirometry
    The European respiratory journal, 2010
    Co-Authors: André Capderou, Berkani M, M. Zelter
    Abstract:

    The interpretation of pulmonary function tests relies on reference values corrected for age, sex and Height. Height may be difficult to measure in patients with deformities of the thoracic cage or those unable to stand up properly. Current practice is to substitute arm Span to Height, once corrected either by a fixed factor or by an age- and sex-dependent regression equation. However arm Span may be difficult to measure in some patients. This study evaluated the relationship between arm Span, measured Height, Height as mentioned on an identity document (ID), sex and age in a population of 2,452 Caucasian subjects with no chest or spine deformities. The present study demonstrates that age and sex have to be taken into account to best predict Height from arm Span or ID Height values. The equations predicting Height from ID Height give the best diagnosis concordance compared to reference in males and females. Age correction does not improve concordance below 70 yrs. The estimation of Height from ID Height can be substituted to that from arm Span when clinically relevant, providing ID Height has been measured before the occurrence of stature problems.

André Capderou - One of the best experts on this subject based on the ideXlab platform.

  • All-age relationship between arm Span and Height in different ethnic groups
    The European respiratory journal, 2014
    Co-Authors: Philip H. Quanjer, André Capderou, M. Mümtaz Mazıcıoğlu, Ashutosh N. Aggarwal, Sudip Datta Banik, Stevo Popovic, Francis A. Tayie, Mohammad Golshan, M. Zelter
    Abstract:

    The objective of the present study was to establish multiethnic, all-age prediction equations for estimating stature from arm Span in males and females. The arm Span/Height ratio (ASHR) from 13 947 subjects (40.9% females), aged 5-99 years, from nine centres (in China, Europe, Ghana, India and Iran) was used to predict ASHR as a function of age using the lambda, mu and sigma method. Z-scores for forced expiratory volume in 1 s (FEV1), forced vital capacity (FVC) and FEV1/FVC in 1503 patients were calculated using measured Height and Height calculated from arm Span and age. ASHR varied nonlinearly with age, was higher in males than in females and differed significantly between the nine sites. The data clustered into four groups: Asia, Europe, Ghana and Iran. Average predicted FEV1, FVC and FEV1/FVC using measured or predicted Height did not differ, with standard deviations of 4.6% for FEV1, 5.0% for FVC and 0.3% for FEV1/FVC. The percentages of disparate findings for a low FEV1, FVC and FEV1/FVC in patients, calculated using measured or predicted Height, were 4.2%, 3.2% and 0.4%, respectively; for a restrictive pattern, there were 1.0% disparate findings. Group- and sex-specific equations for estimating Height from arm Span and age to derive predicted values for spirometry are clinically useful.

  • Reconsidering the arm Span-Height relationship in patients referred for spirometry
    The European respiratory journal, 2010
    Co-Authors: André Capderou, Berkani M, M. Zelter
    Abstract:

    The interpretation of pulmonary function tests relies on reference values corrected for age, sex and Height. Height may be difficult to measure in patients with deformities of the thoracic cage or those unable to stand up properly. Current practice is to substitute arm Span to Height, once corrected either by a fixed factor or by an age- and sex-dependent regression equation. However arm Span may be difficult to measure in some patients. This study evaluated the relationship between arm Span, measured Height, Height as mentioned on an identity document (ID), sex and age in a population of 2,452 Caucasian subjects with no chest or spine deformities. The present study demonstrates that age and sex have to be taken into account to best predict Height from arm Span or ID Height values. The equations predicting Height from ID Height give the best diagnosis concordance compared to reference in males and females. Age correction does not improve concordance below 70 yrs. The estimation of Height from ID Height can be substituted to that from arm Span when clinically relevant, providing ID Height has been measured before the occurrence of stature problems.

Yancy Y. Phillips - One of the best experts on this subject based on the ideXlab platform.

  • Arm Span-Height relationships in patients referred for spirometry.
    American Journal of Respiratory and Critical Care Medicine, 1996
    Co-Authors: Joseph M. Parker, Thomas A. Dillard, Yancy Y. Phillips
    Abstract:

    Arm Span has been proposed as a surrogate for standing Height in the prediction of lung volumes in patients with thoracic deformities or who are unable to stand. The relationship between arm Span and Height has previously been reported as either a fixed ratio unaffected by age or as a regression equation in which the ratio varies as a function of age. We studied the relationship between standing Height, arm Span, race, sex, and age in 202 patients (ages 20 to 88 yrs) referred for screening spirometry. Multiple linear regression analysis found arm Span, race, sex, and age to be predictive of standing Height (r2 = 0.8659, p < 0.0001). Subgroup analysis revealed that age was a significant factor among males of either race, but not among females of either race. Fixed arm Span to Height ratios were also calculated for each group and may be used to estimate standing Height with reasonable accuracy except at extremes of stature.

Joseph M. Parker - One of the best experts on this subject based on the ideXlab platform.

  • Arm Span-Height relationships in patients referred for spirometry.
    American Journal of Respiratory and Critical Care Medicine, 1996
    Co-Authors: Joseph M. Parker, Thomas A. Dillard, Yancy Y. Phillips
    Abstract:

    Arm Span has been proposed as a surrogate for standing Height in the prediction of lung volumes in patients with thoracic deformities or who are unable to stand. The relationship between arm Span and Height has previously been reported as either a fixed ratio unaffected by age or as a regression equation in which the ratio varies as a function of age. We studied the relationship between standing Height, arm Span, race, sex, and age in 202 patients (ages 20 to 88 yrs) referred for screening spirometry. Multiple linear regression analysis found arm Span, race, sex, and age to be predictive of standing Height (r2 = 0.8659, p < 0.0001). Subgroup analysis revealed that age was a significant factor among males of either race, but not among females of either race. Fixed arm Span to Height ratios were also calculated for each group and may be used to estimate standing Height with reasonable accuracy except at extremes of stature.

Zhiye Zhao - One of the best experts on this subject based on the ideXlab platform.

  • A preliminary study of the economic dimension of underground rock caverns for water storage at Singapore
    2018 World Engineering Education Forum - Global Engineering Deans Council (WEEF-GEDC), 2018
    Co-Authors: Junlong Shang, Zhengxian Chua, Hoongping Peh, Zhiye Zhao
    Abstract:

    Due to scarce land resources in Singapore, it is imperative to increase water storage capacities to meet the increasing demand of water to secure a sustainable development, which can be achieved in the underground by rock caverns. In this paper, a preliminary study on the effects of cavern Span, Height and radius on the cavern stability is presented to provide a guidance on the cavern construction in the context of Singapore. It is found that the radius of caverns should be around half of the Span width (i.e., B/R=2) to reduce vertical displacement at the crown of cavern. The smaller the rock cover, the smaller displacement. The minimum rock thickness should be at least the same as the cavern Span to eliminate excessive yielded element. Finally, rock support system is introduced to maintain the profile of caverns.