TABLE 1—

Changing Socioeconomic and Racial/Ethnic Inequalities in Breast Cancer Mortality Among Women Aged 25 to 54 Years in the United Kingdom and the United States: Early 1930s to Early 1970s

		Breast Cancer Mortality (Deaths/100 000 Population)
Time Period	Social Group	Premenopausal, Aged 25–34 Y	Premenopausal, Aged 35–44 Y	Perimenopausal, Aged 45–54 Y
United Kingdom
193151(p187)	Social class I + II: women married to men in professional, managerial, and technical occupations	3.4	22.8	60.6
	Social class III: women married to men in skilled occupations	3.0	20.3	54.6
	Social class IV + V: women married to men in partly skilled and unskilled occupations	2.8	16.5	43.5
197151(p187)	Social class I + II: women married to men in professional, managerial, and technical occupations	4.0	24.9	63.5
	Social class III: women married to men in skilled occupations	4.2	25.8	62.9
	Social class IV + V: women married to men in partly skilled and unskilled occupations	4.7	25.0	62.9
United States
193052	White	2.9	18.1	45.1
	Non-White	5.3	16.2	37.3
194050	White	…	19.2	47.5
	Non-White	…	21.8	47.5
195050	White	…	20.8	47.1
	Non-White	…	20.8	45.3
1956–196152	White	3.8	19.5	50.5
	Non-White	5.3	24.1	48.8
196550	White	…	20.2	51.9
	Non-White	…	24.2	50.8

Note. For the age-specific breast cancer mortality rate among US women aged 25 to 34 years, data from on-line publications are not available for the years 1940, 1950, and 1965. Regarding racial/ethnic terms as used in the US sources, the non-White population in the United States until 1960 was overwhelmingly composed of Black Americans, who constituted 95.2% of non-Whites in 1930, 95.6% in 1940, 95.5% in 1950, 92.1% in 1960, and 88.7% 1970.⁵⁰