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Table 2 Original imbalance ratios

From: Impact of random oversampling and random undersampling on the performance of prediction models developed using observational health data

Outcome of interest

CCAE

MDCD

MDCR

IQVIA Germany

Acute myocardial infarction

 

221.4

60.5

 

Alopecia

191.8

205.8

203.6

 

Constipation

43.6

18.6

16.3

85.3

Delirium

 

245.3

84.5

 

Diarrhea

28.9

16.8

16.7

 

Fracture

174.3

104.7

34.1

185.8

Gastrointestinal hemorrhage

209.5

83.1

44.6

 

Hyponatremia

157.7

85.8

32.4

 

Hypotension

131.6

47.6

21.5

178.3

Hypothyroidism

73.1

76.6

31.9

158.9

Insomnia

19.5

12.7

17.9

57.2

Ischemic stroke inpatient

  

101.1

 

Nausea

20.6

8.6

15.7

60.5

Open-angle glaucoma

  

194.0

 

Seizure

180.5

71.4

90.8

 

Suicide and ideation

49.7

19.2

164.6

 

Tinnitus

158.0

174.8

83.4

152.3

Ventricular arrhythmia and sudden cardiac death inpatient

 

220.7

90.9

 

Vertigo

167.5

202.4

71.9

204.5

  1. Each column represents a database