Table 1

Incidence figures of retinoblastoma cited in the literature

Population	Time period	No of cases	Incidence	Reference
Africa
Bantu, South Africa	1955–75	80	1:10 000	Freedman and Goldberg, 1976²
Malawi	1975	20	1:10 000	BenEzra and Chirambo, 1976³
America
USA	1969–71	59	1:18 000	Devesa, 1975⁴
Michigan, USA	?	49	1:20 000	Falls and Neel, 1951⁵
Ohio, USA	?	126	1:24 000	Macklin, 1961⁶
USA	1974–6	70	1:18 000	Pendergrass and Davis, 1980⁷
Asia
Hokkaido, Japan	1945–57	69	1:24 000	Matsunaga and Ogyu, 1959⁸
Nagasaki, Japan	1965–86	34	1:16 000	Takano et al, 1991⁹
Australia, New Zealand
Australia	1956–76	80	1:17 000	O’Day et al, 197710
New Zealand	1948–77	100	1:18 000	Suckling et al, 198211
Europe
Denmark	1928–57	118	1:19 000	Bech and Jensen, 196112
Finland	1950–64	?	1:16 000	Tarkkanen and Tuovinen, 197113
France	1951–60	295	1:28 000	Briard-Guillemot et al, 197414
Germany	1934–51	48	1:29 000	Vogel, 1979¹
Great Britain	1962–80	431	1:23 000	Sanders et al, 198815
The Netherlands	1927–9	?	1:34 000	Hemmes, 193116
The Netherlands	1945–70	486	1:16 000	DerKinderen et al, 199017
Northern Ireland	1938–56	23	1:27 000	Stevenson and Martin, 195718
Norway	1950–73	75	1:17 000	Hørven, 197319
Sweden	1958–71	88	1:18 000	Kock and Naeser, 197320
Middle East
Riyadh, Saudi Arabia	1982–6	22	1:12 000	Al-Idrissi et al, 199121