Skip to main content

Table 1 Demographic and clinical characteristics of patients aged ≥16 years (all adults group)

From: Influenza vaccine effectiveness against influenza-related hospitalization during a season with mixed outbreaks of four influenza viruses: a test-negative case-control study in adults in Canada

 

Cases

N = 528

Controls

N = 835

p-value

Age, years

 Mean (SD)

67.11 (20.05)

69.17 (16.94)

0.732

 Median (range)

70 (18–104)

73 (18–99)

 

Age subgroups, n (%)

 16–49 years

107 (20.3)

107 (12.8)

0.118

 50–64

101 (19.1)

164 (19.6)

 

 65–75 years

101 (31.6)

206 (36.5)

 

 > 75 years

219 (68.4)

358 (63.5)

 

Female, n (%)

288 (54.5)

469 (56.2)

0.580

BMI, kg/m2

 Mean (SD)

26.51 (6.74)

26.81 (7.07)

0.407

 Median (range)

25.39 (9.64–60.35)

25.73 (10.7–63.77)

 

Obese (BMI ≥30 kg/m2), n (%)

103 (19.5)

229 (27.4)

0.016

≥1 co-morbidity, n (%)

 Cardiac disease

210 (39.8)

415 (49.7)

0.005

 Vascular disease

317 (60.0)

557 (66.7)

0.093

 Pulmonary disease

231 (43.8)

426 (51.0)

0.021

Smoking, n (%)

 Current

89 (16.9)

143 (17.1)

0.529

 Past

143 (27.1)

334 (40.0)

<0.001

Children aged <5 years in household, n (%)

   

 0

456 (86.3)

763 (91.4)

0.001

 1 or more

54 (10.2)

46 (5.5)

 

Received 2011/12 seasonal influenza vaccine, n (%)

262 (49.6)

529 (63.4)

<0.001

Received 2010/11 seasonal influenza vaccine, n (%)

248 (47.0)

515 (61.7)

<0.001

  1. N number of patients, BMI body mass index, SD standard deviation
  2. Missing data: BMI: 40 cases (7.6%), 15 controls (1.8%); Obesity: 40 cases (7.6%), 15 controls (1.8%); Current smoking: 5 cases (0.9%), 7 controls (0.8%); Past smoking: 105 cases (19.9%), 156 controls (18.7%); Children aged <5 years in the household: 18 cases (3.4%), 26 controls (3.1%); Received 2010/11 seasonal influenza vaccine: 47 cases (8.9%), 42 controls (5.0%)