2015
DOI: 10.1016/s2213-2600(15)00157-5
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Mortality prediction in chronic obstructive pulmonary disease comparing the GOLD 2007 and 2011 staging systems: a pooled analysis of individual patient data

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Cited by 140 publications
(136 citation statements)
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“…Bronchodilator reversibility was defined as at least 12% and 200-ml increase in FEV 1 or FVC post-bronchodilator (23). COPD severity was assessed using spirometry criteria outlined by the GOLD guidelines with reference values from the National Health and Nutrition Examination Survey III (24,25). GOLD stage 0 refers to current and former smokers without COPD, which although not included in the current GOLD guidelines, was used previously (26).…”
Section: Study Population and Assessmentsmentioning
confidence: 99%
“…Bronchodilator reversibility was defined as at least 12% and 200-ml increase in FEV 1 or FVC post-bronchodilator (23). COPD severity was assessed using spirometry criteria outlined by the GOLD guidelines with reference values from the National Health and Nutrition Examination Survey III (24,25). GOLD stage 0 refers to current and former smokers without COPD, which although not included in the current GOLD guidelines, was used previously (26).…”
Section: Study Population and Assessmentsmentioning
confidence: 99%
“…These mortality studies have consistently shown that group A has the lowest risk, while D has the highest risk. Some studies have shown that group B patients have worse risk compared to group C 9,12,15,22 , giving a risk ordering of A (lowest) -C -B -D (highest), while for other studies the risk ordering is A -B -C -D [17][18][19]27 ; representative survival curves for these two patterns are shown in figure 3. There is evidence that groups B and D have the highest prevalence of patients with cardiovascular comorbidities 14,15 , which presumably contributes to the increased symptoms and also increased mortality risk.…”
Section: Does Combined Assessment Improve Risk Stratification?mentioning
confidence: 99%
“…Data from different COPD cohorts have been used to understand the percentage of patients falling into groups A, B, C, and D; these data are shown in table 1 9,[11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] . There are considerable differences between some studies, which can be attributed to many factors, including the study design and inclusion criteria, how the patients were recruited (e.g.…”
Section: The Combined Assessment Explainedmentioning
confidence: 99%
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“…Moreover, the GOLD 2011 re-classification shifted the overall COPD severity distribution to more severe categories, but without clearly documented benefits on outcomes [14]. Furthermore, the ABCD classification based on airflow severity and patient-reported outcome caused some confusion: for example, group C (high risk without significant symptoms) was rather uncommon, and had similar exacerbation frequency than group B (high symptoms but low risk); on the other hand, group D (which included subjects with severe airflow limitation alone, or with history of frequent exacerbations alone, or with both risk factors) had significant heterogeneity in exacerbation rate [15,16].…”
Section: Diagnosis and Assessmentmentioning
confidence: 99%