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Table 3 Attack rates (AR) and relative risks for persons with serologically confirmed influenza infection (SCII) as outcome, by exposure (n = 736), sorted by p-value

From: Seasonal influenza risk in hospital healthcare workers is more strongly associated with household than occupational exposures: results from a prospective cohort study in Berlin, Germany, 2006/07

  Exposed Unexposed    
Exposure SCII Total AR% SCII Total AR% Relative risk 95% confidence interval P-value
Household car ownership 66 551 12.0 10 176 6 2.11 1.11-4.01 0.02
Immunisation in current season 18 257 7.0 60 479 13 0.56 0.34-0.93 0.02
Household contacts          
Lives alone 3 75 4.0 - - - Ref - -
Lives with adults 43 430 10.0 - - - 2.50 0.80-7.85 0.13
1 or 2 children 24 198 12.1 - - - 3.03 0.94-9.77 0.07
3 or more children 8 33 24.2 - - - 6.06 1.72-21.41 <0.01
7 or more daily child patient contacts 8 45 17.8 70 691 10.13 1.75 0.90-3.42 0.11
Doctor 7 39 18.0 71 697 10.19 1.76 0.87-3.57 0.13
Being employed 70 685 10.2 8 51 15.69 0.65 0.33-1.28 0.22
Current smoker (at recruitment) 28 224 12.5 50 502 9.96 1.25 0.81-1.94 0.31
Male sex 25 217 11.5 53 519 10.21 1.13 0.72-1.77 0.60
Working 30+ hours per week 60 581 10.3 18 155 11.61 0.89 0.54-1.46 0.64
Healthcare worker 28 250 11.2 50 486 10.29 1.09 0.70-1.68 0.70
Regular public transport use 47 431 10.9 31 302 10.26 1.06 0.69-1.63 0.78
Nurse (qualified or trainee) 20 206 9.7 50 486 10.29 0.94 0.58-1.54 0.82
Age 16-24 years 18 177 10.2 60 559 10.7 0.95 0.57-1.56 0.83
Age 25-49 years 44 392 11.2 34 344 9.9 1.14 0.74-1.73 0.56
Age 50+ years 16 167 9.6 62 569 10.9 0.88 0.52-1.48 0.78