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Table 1 Age and sex distribution of suspected yellow fever cases reported and cumulated age group proportions in Nigeria between September 2017 and 2 September 2019

From: The resurgence of yellow fever outbreaks in Nigeria: a 2-year review 2017–2019

Age Group Male Female Total Age proportion (%) Cumulative proportion (%) Female:male ratio
 < 1 year 12 (57%) 9 (43%) 21 0 0 1.3:1
1–5 years 993 (62%) 617 (38%) 1610 20 20 1.6:1
6–10 years 821 (61%) 527 (39%) 1348 17 37 1.6:1
11–15 years 522 (61%) 338 (39%) 860 11 48 1.5:1
16–20 years 505 (54%) 429 (46%) 934 12 60 1.2:1
21–25 years 462 (53%) 410 (47%0 872 11 71 1.1:1
26–30 years 360 (52%) 332 (48%) 692 9 80 1.1:1
31–35 years 211 (52%) 198 (48%) 409 5 85 1.1:1
36–40 years 205 (56%) 158 (44%) 363 5 90 1.3:1
41–45 years 120(58%) 88 (42%) 208 3 93 1.4:1
46–50 years 100(53%) 90 (47%) 190 2 95 1.1:1
51–55 years 50 (55%) 41 (45%) 91 1 96 1.2:1
56–60 years 54 (57%) 40 (43%) 94 1 97 1.4:1
61 years +  80 (52%) 74 (48%) 154 2 99 1.1:1
Unknown/missing 33 (69%) 15 (31%) 48 1 100 2.2:1
Total 4528 (57%) 3366 (43%) 7894 100   1.3:1
  1. *Descriptive statistics: Mean = 19.3 standard error = 0.17 median = 16 mode = 4 standard deviation = 15.4 range = 0–92 confidence level (95.0%) = 0.34