Table 4. Estimated population sizes and incidence^a of haemopoietic malignancies among three socio-economic groups of inhabitants of Ibadan, Nigeria (1979–1978).

		Low (SES 4 + 5)	Medium (SES 3)	High (SES 1 + 2)
% of total populationb		75	12.5	12.5
Estimated population sizec ×103		750–1500	125–250	125–250
Adults (53%)d × 103		397.5–795	66.25–132.5	66.25–132.5
Children (47%)d × 103		352.5–705.0	58.75–117.5	58.75–117.5
Disease	Age range in years	[Number of cases] and incidencea (×10-5)
BL	<15	[51] 1.81–3.62	[1] 0.21–0.42	[0] 0.0
ALL	<15	[8] 0.25–0.50	[3] 0.56–1.13	[4] 0.75–1.51
AML	<15	[13] 0.41–0.82	[1] 0.18–0.37	[1] 0.18–0.37
ALL	≥15	[4] 0.11–0.22	[0] 0.0	[0] 0.33–0.67
AML	≥15	[7] 0.20–0.39	[1] 0.16–0.33	[1] 0.16–0.33
CML	≥15	[11] 0.17–0.33	[2] 0.18–0.36	[2] 0.18–0.36
CLL	≥15	[14] 0.20–0.41	[1] 0.09–0.17	[1] 0.09–0.17
HD	<15	[6] 0.19–0.37	[2] 0.42–0.85	[0] 0.0
HD	≥15	[16] 0.50–1.00	[9] 1.70–3.40	[0] 0.0
NB/NHL	0–80	[25] 0.42–0.83	[3] 0.30–0.60	[2] 0.20–0.40

^aLeukaemia and lymphoma incidence (cases per 100,000 per year) is based on total number of cases(in bracket) accruing over 4.5 years (July, 1978 to December 1983) for leukaemia, and over 4 years(Jan. 1979 to December 1983) for lymphoma.

^b[63]

^cProjected from 1963 census figures at the estimated growth rate of between 2.5% and 5.0% [64].

^dWorld Bank [34].