Table 1.
General characteristics of participating GPs: figures are numbers (percentage) unless stated otherwise.
| 2002 | 2003 | |||
| VAC | UNVAC | VAC | UNVAC | |
| General | ||||
| Men | 50/77 (64.9) | 25/45 (55.6) | 61/100 (61.0) | 18/40 (45.0) |
| Mean (SE) of age | 42.4 (1.1) | 40.0 (1.5) | 43.1 (0.9) | 41.3 (10.8) |
| Influenza vaccine 1 and 2 years before | 60/77 (77.9) | 3/43 (7.0) ‡ | 67/94 (71.3) | 3/38 (7.9) ‡ |
| Influenza vaccine 1 year before | 66/77 (85.7) | 3/44 (6.8) ‡ | 78/95 (82.1) | 3/39 (7.7) ‡ |
| Influenza vaccine 1, 2, and 3 years before | 54/71 (76.1) | 1/42 (2.4)‡ | 62/91 (68.1) | 3/38 (7.9) ‡ |
| Influenza vaccine 2 years before | 64/77 (83.1) | 8/43 (18.6) ‡ | 73/94 (77.7) | 3/38 (7.9) ‡ |
| Influenza vaccine 3 years before | 59/71 (83.1) | 6/42 (14.3) ‡ | 73/91 (80.2) | 4/38 (10.5) ‡ |
| Influenza disease 1 year before | 9/75 (12.0) | 7/42 (16.7) | 11/93 (11.8) | 4/38 (10.5) |
| Working in Child and Family preventive medicine facility | 11/75 (14.7) | 4/45 (8.9) | 13/100 (13.0) | 4/40 (10.0) |
| Having young children < 7 years of age | 20/70 (28.6) | 14/44 (31.8) | 21/98 (21.4) | 10/40 (25.0) |
| Smoking | 7/72 (9.7) | 3/42 (7.1) | 9/96 (9.4) | 1/39 (2.6) |
| Allergy | 21/72 (29.2) | 9/42 (21.4) | 23/94 (24.5) | 6/38 (15.8) |
| Seroprotection at baseline1 against A:/H3N2 | 61/67 (91.0) | 31/39 (79.5) | 56/80 (70.0) | 15/36 (41.7) † |
| GMT12 A:/H3N2 (SE) | 125.39(1.12) | 77.26 (1.19) † | 54.25 (1.14) | 22.34 (1.23) ‡ |
| Information from the diaries | ||||
| GPs with family members with influenza | 34/66 (51.5) | 19/35 (54.3) | 54/96 (56.3) | 20/40 (50.0) |
| GPs with colleagues with influenza | 23/66 (34.8) | 12/35 (34.3) | 35/96 (36.5) | 15/40 (37.5) |
| Mean (SE) number of patient contacts/day | 21.3 (1.0) | 17.9 (1.3) † | 20.4 (0.8) | 16.6 (1.2) † |
| Mean (SE) number of patients with influenza/day | 1.6 (0.2) | 1.7 (0.2) | 2.0 (0.2) | 2.1 (0.3) |
1number of GPs with a baseline titre (T1) > 40
2 geometric mean baseline titre (T1)
† p-value < 0.05
‡ p-value < 0.0001