Table 3 Univariate and multivariate analysis of rifampicin concentration considering age, gender and ethnicity
|  | n (%) | Median plasma concentration μg/ml (IQR) | Univariate analysis p | Multivariate analysis p |
|---|---|---|---|---|
Age groups (years) | Â | Â | Â | Â |
 ≤ 2 years | 6 | 10.46 (0.13–13.16) |  |  |
 2–12 years | 41 | 13.17 (8.45–17.30) | 0.11 |  < 0.001 |
 > 12 years | 21 | 8.96 (0.13–12.35) | 0.61 | 0.15 |
Gender | Â | Â | Â | Â |
 Male | 51 | 10.63 (3.51–16.28) | 0.24 | 0.31 |
 Female | 17 | 12.16 (10.29–17.03) |  |  |
Ethnicity | Â | Â | Â | Â |
 African | 5 | 17.30 (13.16–18.90) | 0.02 |  < 0.01 |
 Asiatic | 7 | 14.26 (7.44–18.32) | 0.03 | 0.05 |
 South American | 13 | 12.16 (10.87–16.67) | 0.04 | 0.05 |
 Caucasian | 43 | 9.6 (0.19–15.72) |  |  |