Table 1 CT image dataset division.

From: A robust chronic obstructive pulmonary disease classification model using dragonfly optimized kernel extreme learning machine

S. No

Stage of the disease

Training images

Testing images

Total

1.

Grade 1 COPD

104

30

134

2.

Grade 2 COPD

113

25

138

3.

Grade 3 COPD

101

30

131

4.

Grade 4 COPD

130

27

157

5.

Total

448

112

560

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