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Table 2 Baseline characteristics of cases during the 2018 cholera outbreak in Nigeria (N = 43,996)
| Baseline characteristic | Frequency (%) |
|---|---|
| Sociodemographic characteristic | |
| Sex | |
| Female | 22,322 (50.74) |
| Male | 21,674 (49.26) |
| Median (IQR) age, yearsa | 14 (5–30) |
| Age, years | |
| < 2 | 2602 (5.91) |
| 2–4 | 7651 (17.39) |
| 5–10 | 8068 (18.34) |
| 10–14 | 3300 (7.50) |
| > 15 | 21,014 (47.76) |
| Missing | 1361 (3.09) |
| Geopolitical zone | |
| South-east | 205 (0.47) |
| North-central | 1335 (3.03) |
| North-west | 19,850 (45.12) |
| North-east | 22,606 (51.38) |
| Epidemiological wave | |
| First wave (week 1–9 of 2018) | 1119 (2.54) |
| Second wave (week 10–28 of 2018) | 17,528 (39.84) |
| Third wave (week 29–34 of 2018) | 7454 (16.94) |
| Fourth wave (week 35–47 of 2018) | 17,895 (40.67) |
| Season | |
| Dry | 2427 (5.52) |
| Rainy | 41,569 (94.48) |
| Outbreak setting | |
| Rural | 15,501 (35.23) |
| Peri-urban | 5941 (13.50) |
| Urban | 22,077 (50.18) |
| Missing | 477 (1.08) |
| Clinical characteristic | |
| Time to healthcare seeking | |
| Same day | 27,470 (62.44) |
| 1–2 days | 10,159 (23.09) |
| > 2 days | 1695 (3.85) |
| Missing | 4672 (10.62) |
| Location healthcare was sought | |
| Primary healthcare centre | 8464 (19.24) |
| Secondary hospital | 6294 (14.31) |
| Tertiary hospital | 58 (0.13) |
| Private clinic | 143 (0.33) |
| Cholera treatment centre (including IDP camps) | 730 (1.66) |
| Home | 9 (0.02) |
| Missing | 28,298 (64.32) |
| Hospitalisation | |
| No | 6096 (13.86) |
| Yes | 20,224 (45.97) |
| Missing | 17,676 (40.18) |
| Stool sample collected for microbial test | |
| No | 21,597 (49.09) |
| Yes | 1139 (2.59) |
| Missing | 21,260 (48.32) |
| Stool sample tested for V. cholerae | |
| No | 42,928 (97.57) |
| Yes | 1068 (2.43) |
| Rapid diagnostic test outcome | |
| Negative | 205 (0.47) |
| Positive | 888 (2.02) |
| Pending | 3 (0.01) |
| Unknown | 42,900 (97.51) |
| Culture outcome | |
| Negative | 41 (0.09) |
| Positive | 92 (0.21) |
| Pending | 4 (0.01) |
| Unknown | 43,859 (99.69) |
| Clinical outcome | |
| Alive | 43,160 (98.10) |
| Died | 836 (1.90) |
