Table 2.
Variable | Cases | Controls (n=144) | Matched odds ratio (95% CI) | P value |
---|---|---|---|---|
Preceding illness* | 76/144 (53) | 45/144 (31) | 2.3 (1.4 to 3.7) | 0.001 |
Preceding illness (controlled for “high” season of meningococcal disease) | — | — | 2.0 (1.2 to 3.3) | 0.006 |
Epstein-Barr virus (positive for viral capsid antibody IgG) | 105/129 (81) | 89/116 (77) | 1.8 (0.9 to 3.6) | 0.12 |
Mannose-binding lectin (very low producers) | 20/112 (18) | 13/111 (12) | 1.3 (0.6 to 3.0) | 0.53 |
Influenza H3N2 convalescent titre >320 | 48/116 (41) | 45/120 (38) | 1.2 (0.6 to 2.2) | 0.63 |
Influenza H1N1 convalescent titre >320 | 16/116 (14) | 16/120 (13) | 0.8 (0.3 to 2.1) | 0.62 |
Influenza B convalescent titre >80 | 10/116 (9) | 8/120 (7) | 1.2 (0.4 to 3.5) | 0.78 |
Received meningococcal vaccination (polysaccharide or conjugate) | 37/144 (26) | 54/143 (38) | 0.4 (0.2 to 0.8) | 0.01 |
Born at less than 37 completed weeks of pregnancy | 14/142 (10) | 7/140 (5) | 2.2 (0.8 to 5.7) | 0.12 |
In the fortnight period before illness (cases) or interview (controls).