true index
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2018 ◽  
Vol 173 ◽  
pp. 69-72 ◽  
Author(s):  
Ana-Isabel Guerra ◽  
Antonio Manresa ◽  
Ferran Sancho

2017 ◽  
Vol 3 (4) ◽  
pp. 00075-2017 ◽  
Author(s):  
Federico Longhini ◽  
Davide Colombo ◽  
Lara Pisani ◽  
Francesco Idone ◽  
Pan Chun ◽  
...  

The objective of this study was to assess ability to identify asynchronies during noninvasive ventilation (NIV) through ventilator waveforms according to experience and interface, and to ascertain the influence of breathing pattern and respiratory drive on sensitivity and prevalence of asynchronies.35 expert and 35 nonexpert physicians evaluated 40 5-min NIV reports displaying flow–time and airway pressure–time tracings; identified asynchronies were compared with those ascertained by three examiners who evaluated the same reports displaying, additionally, tracings of diaphragm electrical activity. We determined: 1) sensitivity, specificity, and positive and negative predictive values; 2) the correlation between the double true index (DTI) of each report (i.e., the ratio between the sum of true positives and true negatives, and the overall breath count) and the corresponding asynchrony index (AI); and 3) the influence of breathing pattern and respiratory drive on both AI and sensitivity.Sensitivities to detect asynchronies were low either according to experience (0.20 (95% CI 0.14–0.29) for expert versus 0.21 (95% CI 0.12–0.30) for nonexpert, p=0.837) or interface (0.28 (95% CI 0.17–0.37) for mask versus 0.10 (95% CI 0.05–0.16) for helmet, p<0.0001). DTI inversely correlated with the AI (r2=0.67, p<0.0001). Breathing pattern and respiratory drive did not affect prevalence of asynchronies and sensitivity.Patient–ventilator asynchrony during NIV is difficult to recognise solely by visual inspection of ventilator waveforms.


1995 ◽  
Vol 45 (3-4) ◽  
pp. 179-194 ◽  
Author(s):  
Shoutir Kishore Chatterjee ◽  
Sisir Kumar Samanta

When the hypothesis of equality of means of several univariate homoscedastic normal populations from which independent samples are available, is rejected on the basis of the ANOV A F-test, the populations have to be divided into disjoint groups such that within each group the populations are all same. For any such division a natural index of correctness of the grouping is defined and a procedure is proposed such that it leads to the choice of a division for which the true index does not fall below a stipulated threshold at a given level of confidence. The procedure is illustrated through some numerical examples.


Author(s):  
S. N. Afriat
Keyword(s):  

1984 ◽  
pp. 37-56 ◽  
Author(s):  
S. N. Afriat
Keyword(s):  

1980 ◽  
Vol 48 (3) ◽  
pp. 369
Author(s):  
Jacqueline Fourastié ◽  
K. S. Banerjee ◽  
Jacqueline Fourastie

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