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Table 2 Feature selected in the phased data sets of AECOPD patients

From: Exploratory study on classification of chronic obstructive pulmonary disease combining multi-stage feature fusion and machine learning

Phase

Data snippet

Description

Feature sets

k = 1

Seg_1

Basics

Gender, age, et al.

k = 2

Seg_2

Comorbidities

Pulmonary heart disease,et al.

k = 3

Seg_3

Inflammations

C-reactive protein, et al.

k = 4

Seg_4

Metabolism

Oxygen saturation, et al.