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Table 3 Baseline characteristics of COVID-19 patients with PPI and H2RA in the secondary analysis

From: Comparative risk of incidence and clinical outcomes of COVID-19 among proton pump inhibitor and histamine-2 receptor antagonist short-term users: a nationwide retrospective cohort study

Characteristics, %

Before propensity score matching

After propensity score matching

PPI users (n = 420)

H2RA users (n = 840)

Absolute standardized difference

PPI users (n = 410)

H2RA users (n = 804)

Absolute standardized difference

Age group, %

 18–19

<  1.2

1.7

0.06

<  1.2

1.7

0.06

 20–24

4.8

10.4

0.21

4.9

4.8

0.01

 25–29

4.5

8.1

0.15

4.6

4.3

0.02

 30–34

4.0

2.9

0.06

4.1

4.0

0.01

 35–39

2.6

7.0

0.21

2.7

2.8

0.01

 40–44

3.1

5.2

0.11

3.2

3.7

0.03

 45–49

5.7

7.5

0.07

5.9

4.7

0.05

 50–54

12.1

8.3

0.13

12.2

11.2

0.03

 55–59

12.1

10.7

0.04

12.4

12.2

0.01

 60–64

16.7

10.1

0.19

16.3

13.1

0.09

 65–69

10.2

7.3

0.10

10.0

9.6

0.01

 70–74

6.9

6.4

0.02

6.8

7.8

0.04

 75–79

7.1

6.5

0.02

7.3

8.9

0.06

 80–84

4.5

3.8

0.04

4.4

5.2

0.04

85–89

3.3

3.0

0.02

2.9

4.4

0.08

 Gender: female, %

60.7

66.8

0.08

61.0

65.9

0.02

Medical history: general, %

 Chronic obstructive lung disease

<  0.1

<  0.1

<  0.1

<  0.1

0.12

0.09

 Chronic kidney disease

<  0.1

<  0.1

0.11

<  0.1

<  0.1

0.09

 Charlson comorbidity index

3.0

2.3

0.27

3.0

2.7

0.1

  1. Values are presented as proportion of the patients (%)
  2. Abbreviation: COVID-19 SARS-CoV-2 infection, PPI proton pump inhibitor, H2RA histamione-2 receptor antagonist