Table 12 Chi-square tests comparing feature significance in fully vaccinated versus unvaccinated individuals across the Alpha, Delta and Omicron waves.

From: The effect of SARS-CoV-2 variant on respiratory features and mortality

Variant

Feature

Fully vaccinated (n = 11,556)

Unvaccinated (n = 39,646)

Odds ratio

Chi-square p-value

Alpha

Pneumonia

12

3648

1.99

0.032

Delta

Acute pharyngitis

44

248

1.69

 < 0.01

Acute respiratory failure

88

577

2.04

 < 0.001

Acute upper respiratory infection

86

371

1.28

0.045

Hypoxemia

43

205

1.42

0.047

Pneumonia

161

835

1.62

 < 0.001

Omicron

Abnormal lung findings

128

127

0.62

 < 0.001

Acute pharyngitis

508

984

1.23

 < 0.001

Acute respiratory failure

287

604

1.34

 < 0.001

Acute upper respiratory infection

445

1176

1.72

 < 0.001

Cough

1043

1477

0.88

 < 0.01

Disorder of nasal cavity

270

561

1.32

 < 0.001

Dyspnea

359

444

0.77

 < 0.001

Pneumonia

452

891

1.255

 < 0.001

  1. p-value < 0.05 is significant.
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