Exposure (n = 736 unless otherwise specified) | Healthcare workers (N = 250) | Non-Healthcare workers (N = 486) | P (chi-squared, unless otherwise specified) |
---|---|---|---|
Age, mean (years) | 35.7 | 39.2 | P < 0.001 (Kruskal-Wallis) |
Male sex (%) | 57 (22.8%) | 160 (32.9%) | P < 0.001 |
Immunisation in current season (2006/07) (n = 736) | 104 (41.6%) | 153 (31.5%) | 0.006 |
Immunised 2005/6 (n = 728) | 103 (41.7%) | 184 (38.3%) | 0.37 |
Immunised 2004/5 (n = 712) | 77 (32.1%) | 162 (34.3%) | 0.55 |
Immunised 2003/4 (n = 696) | 53 (22.7%) | 132 (28.6%) | 0.10 |
Current smoker at recruitment (n = 726) | 99 (40.6%) | 125 (25.9%) | P < 0.01 |
Children at home | 87 (34.8%) | 144 (29.6%) | 0.15 |
Patient contacts (per typical day) | 30.8 | Not applicable | |
Contacts at work (per typical day, excluding patients), mean (n = 730) | 14.3 | 13.8 | 0.021 (Kruskal-Wallis) |
Contacts at home (per typical day), mean | 2.7 | 3.5 | P < 0.001 (Kruskal-Wallis) |
Car owner (n = 727) | 199 (80.6%) | 352 (73.3%) | 0.03 |
Regular use of public transport (n = 733) | 128 (51.6%) | 303 (62.5%) | 0.005 |
Preseasonal titer of <40 against A/California/07/2004 (H3N2) among non-vaccinated | 97 (69.7%) | 269 (79.1%) | 0.03 |