Skip to main content

Table 6 Characteristics of patients included in the primary analysis by vaccination status

From: Influenza epidemiology and influenza vaccine effectiveness during the 2016–2017 season in the Global Influenza Hospital Surveillance Network (GIHSN)

Risk variables

 

Unvaccinated

Vaccinated

P value

Category

n

%

n

%

 

Number of patients, n (%)

Controls

6307

70.7

938

77.1

< 0.0001

 

Cases

2616

29.3

279

22.9

 

Age (y)

Median (range)

11.4 (0–105.3)

76.5 (0.6–102.8)

< 0.0001

Age group, n (%) (2)

0–5 months

1254

14.3%

0

0.0%

< 0.0001

 

6–11 months

643

7.3%

13

1.1%

 

1–4 yrs

1948

22.2%

51

4.3%

 

5–17 yrs

760

8.7%

67

5.6%

 

18–49 yrs

1988

22.7%

112

9.4%

 

50–64 yrs

628

7.2%

106

8.9%

 

65–74 yrs

583

6.6%

210

17.6%

 

75–84 yrs

566

6.5%

337

28.2%

 

≥85 y

403

4.6%

299

25.0%

 

Sex, n (%)

Male

4462

50.0%

643

52.8%

0.0641

Female

4461

50.0%

574

47.2%

 

Comorbidities, n (%)

None

6123

68.6%

303

24.9%

< 0.0001

1

1457

16.3%

355

29.2%

 

> 1

1343

15.1%

559

45.9%

 

Pregnant, n (%)

921

69.5%

19

40.4%

< 0.0001

Obesity, n (%)

1148

13.8%

309

26.7%

< 0.0001

Previous hospitalisation within 12 months, n (%)

1914

24.1%

406

37.7%

< 0.0001

GP visit within 3 months, n (%)

None

3074

38.8%

209

19.4%

< 0.0001

1

1740

21.9%

188

17.4%

 

> 1

3116

39.3%

681

63.2%

 

Smoking, n (%)

Current

2112

24.1%

158

13.0%

< 0.0001

Past

1618

18.5%

388

32.0%

 

Never

5037

57.5%

667

55.0%

 

Functional impairment in ≥65 y, n (%)

None or minimal

72

5.4%

58

7.0%

0.4086

Mild

32

2.4%

18

2.2%

 

Moderate

52

3.9%

41

4.9%

 

Severe

309

23.1%

191

23.0%

 

Total

871

65.2%

523

62.9%

 

Sampling interval (days)

Median (range)

3 (0–9)

 

4 (0–9)

 

< 0.0001

Sampling interval, n (%)

≤4 days

6377

72.1%

781

64.2%

< 0.0001

5–7 days

2148

24.3%

357

29.3%

 

8–9 days

315

3.6%

79

6.5%

 

Site, n (%)

St. Pet

1851

20.7%

86

7.1%

< 0.0001

Moscow

1555

17.4%

65

5.3%

 

Kazakhstan

159

1.8%

0

0.0%

 

Czech Republic

105

1.2%

6

0.5%

 

Canada

993

11.1%

139

11.4%

 

Romania

380

4.3%

7

0.6%

 

Turkey

392

4.4%

21

1.7%

 

Valencia

1300

14.6%

825

67.8%

 

Tunisia

37

0.4%

2

0.2%

 

Suzhou/Shanghai

469

5.3%

1

0.1%

 

India

482

5.4%

11

0.9%

 

Mexico

301

3.4%

49

4.0%

 

South Africa

899

10.1%

5

0.4%

 

Vaccinated, n (%)

In 2015–2016

718

8.0%

949

78.0%

< 0.0001

In 2014–2015

589

6.6%

818

67.2%

< 0.0001