Volume 19, Number 4—April 2013
CME ACTIVITY - Research
Risk Factors for Influenza among Health Care Workers during 2009 Pandemic, Toronto, Ontario, Canada
Table 1
Characteristics of study participants in the Influenza Cohort Study performed during 2009 pandemic, Toronto, Ontario, Canada*
Characteristic | Participant values by cohort, n = 732 |
||
---|---|---|---|
No. HCWs in acute care facilities, n = 563 | No. non-HCWs in office settings, n = 169 | p value | |
Mean age, y (± SD) | 42.2 (11.3) | 45.4 (10.8) | 0.001 |
Female sex |
478/563 (84.9) |
133/169 (78.7) |
0.06 |
Recipient of vaccine | |||
A(H1N1)pdm09 vaccine† | 469/554 (84.7) | 66/165 (40.0) | <0.001 |
Seasonal influenza vaccine 2009–10 | 226/563 (40.1) | 41/169 (24.3) | <0.001 |
Seasonal influenza vaccine 2008–09 |
407/552 (73.7) |
76/164 (46.3) |
<0.001 |
Underlying health conditions | |||
Asthma | 55/555 (9.9) | 14/167 (8.4) | 0.56 |
Diabetes mellitus | 22/555 (4.0) | 5/165 (3.0) | 0.58 |
Allergies to airborne irritants | 235/509 (46.2) | 60/155 (38.7) | 0.10 |
Current smoker or smoker in household |
73/551 (13.3) |
27/163 (16.6) |
0.28 |
Potential exposure conditions | |||
Hand-to-face habits | 275/557 (49.4) | 76/168 (45.2) | 0.35 |
Wearing of prescription eyeglasses | 386/561 (68.8) | 119/168 (70.8) | 0.62 |
Reusable water bottle use >1/week | 232/556 (41.7) | 81/169 (47.9) | 0.15 |
Public transit: >8 trips per week | 196/558 (35.1) | 45/168 (26.8) | 0.04 |
Group gathering attendance | 524/563 (93.1) | 150/167 (89.8) | 0.17 |
Face-to-face contacts/d, median (IQR) | 10 (5, 20) | 10 (5, 20) | 0.94 |
>1 person/bedroom in household | 192/551 (34.9) | 51/166 (30.7) | 0.33 |
Children in workplace | 62/558 (11.1) | 9/167 (5.4) | 0.03 |
Child <5 y in household | 77/563 (13.7) | 10/169 (5.9) | 0.006 |
Child <18 y in household | 212/563 (37.7) | 59/169 (34.9) | 0.52 |
Child in household attends day care | 77/555 (13.9) | 16/164 (9.8) | 0.17 |
*Data are no./total (%) unless otherwise specified. HCW, health care worker; A(H1N1)pdm09, pandemic influenza A(H1N1) 2009 virus; IQR, interquartile range.
†Participants who had acquired A(H1N1)pdm09 <7 d after vaccination were considered unprotected.
1Additional members of the Working Adult Influenza Cohort Study Group are listed at the end of this article.
1Additional members of the Working Adult Influenza Cohort Study Group are listed at the end of this article.