Table 1.
Patient characteristics. Continuous variables are presented as median (IQR) and categorical variables are presented as number and percentage
| Primary | Secondary | Unknown | p value | Odds Ratio (95% CI) | ||
|---|---|---|---|---|---|---|
| N = 105 | N = 144 | N = 44 | ||||
| (36%) | (49%) | (15%) | ||||
| Age (years) | 13 (10.0–16.0) | 14 (11.0–19.0) | 14 (12.0–19.8) | < 0.001 | 1.11 (1.05–1.17) | |
| Sex (% male) | 79 (75) | 76 (53) | 35 (79) | < 0.001 | 2.79 (1.61–4.83) | |
| Day of fever at enrolment, Number (%) | 1 | 6 (6) | 5 (4) | 4 (9) | 0.1 | |
| 2 | 51 (49) | 54 (38) | 19 (43) | |||
| 3 | 45 (43) | 82 (57) | 21 (48) | 1.40 (0.94, 2.10) | ||
| 4 | 2 (2) | 3 (2) | 0 (0) | |||
| 5 | 1 (1) | 0 (0) | 0 (0) | |||
| Serotype Number (%) | 1 | 75 (71) | 55 (38) | 8 (18) | < 0.001 | – |
| 2 | 18 (17) | 40 (28) | 17 (40) | 3.03 (1.57–5.84) | ||
| 3 | 9 (9) | 13 (9) | 7 (15) | 1.96 (0.79–4.91) | ||
| 4 | 3 (3) | 36 (25) | 12 (27) | 16.36 (4.79–55.88) | ||
P-values are for comparisons between primary and secondary infections, using univariate logistic regression