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Table 1 Demographic and clinical characteristics of controls and influenza cases

From: Influenza vaccine effectiveness in patients hospitalized with severe acute respiratory infection in Lithuania during the 2019–2020 influenza season: a test negative case – control study

 

Influenza negative

N = 52 (61.9%)

Influenza positive

N = 32 (38.1%)

p-value

Sex

Female

30 (35.7)

16 (19.0)

0.49a

Age, median (1st ; 3rd quartile)

72.5 (62.5; 82.8)

66 (43.5; 80.5)

0.15c

Age ≥ 65 y. o.

36 (42.9)

17 (20.2)

0.14a

SIV in the current season

12 (14.3)

4 (4.8)

0.23a

Current smoker

11 (13.1)

5 (6.0)

0.53a

At least one underlying medical condition:

49 (58.3)

28 (33.3)

0.42b

 Heart diseases

37 (44.1)

14 (16.7)

0.01a

 Diabetes

11 (13.1)

5 (6.0)

0.53a

 Cancer

12 (14.3)

6 (7.1)

0.64a

 Hematologic cancer

1 (1.2)

2 (2.4)

0.56b

 Lung diseases

12 (14.3)

4 (4.8)

0.23a

 Renal diseases

10 (11.9)

3 (3.6)

0.35b

 Dementia

6 (7.1)

1 (1.2)

0.24b

 Cirrhosis

2 (2.4)

0 (0.0)

0.52b

 Anemia

6 (7.1)

1 (1.2)

0.24b

 Immunodeficiency and solid organ recipients

2 (2.4)

4 (4.8)

0.20b

 Obesity (BMI ≥ 30)

16 (19.3)

8 (9.5)

0.57a

  1. a - Chi-square test; b - Fisher’s Exact test (2-sided); c – Mann-Whitney test
  2. SIV – seasonal influenza vaccination