Published online by Cambridge University Press: 03 March 2009
An index of childhood mortality is proposed as a good measure of socioeconomic well-being and inequality. The index is used to investigate the relationship between childhood mortality and occupation and income of parents. The sources consist of the 1900 United States Census public-use sample and the published 1911 Census of Marriage and Fertility of England and Wales. Results revealed more inequality in mortality and income across social-class groupings in England and Wales than in the United States. The outcome arose more because of relatively higher childhood mortality for white-collar groups in the United States than because of a better situation for blue-collar groups.
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25 For England and Wales, the standard life table chosen gives a mortality level slightly too favorable. The mortality index for the country as a whole is actually 1.06 instead of 1.00. But that is really only important as a scaling matter, on the assumption of linear relationships. Linear relationsips are a close approximation in the intermediate range of Coale and Demeny model life tables. For the United States, the standard life table chosen yields a mortality index for the country as a whole of 1.0088, which is very close to 1.00.Google Scholar
26 As a check on the data for England and Wales, the differentials were compared to those from the first vital statistics tabulation (1911) of the infant mortality rate by this social class categorization. (Great Britain, Registrar General, Seventy-Fourth Annual Report of the Register General of Births, Deaths, and Marriages in England and Wales, 1911 [London, 1913], pp. 73, 88.) The results are as follows:Google Scholar
The comparison is quite close, despite the fact that the census results apply to children as well as infants, while the vital statistics results apply only to infants. Further, the vital statistics data come from only one year of experience (1911) and are thus subject to more variability. In addition, a zero- order correlation between 116 detailed occupational categories of the census mortality index and the 1911 vital statistics infant mortality rate gave a quite close relationship (r = 0.960)
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29 For a discussion of problems with the 1911 English census social class categories, see Armstrong, W. A., “The Use of Information about Occupation,” in Wrigley, E. A., ed., Nineteenth Century Society: Essays in the Use of Quantitive Methods for the Study of Social Data (Cambridge, 1972), pp. 203–6.Google Scholar
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33 Preston, Haines, and Pamuk, “Effects of Industrialization and Urbanization,” Tables I and 2. For England and Wales, the mortality index values were: London 1.06; county boroughs 1.23; other urban districts 1.03; rural districts .84.Google Scholar
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35 Income measures between the United States and England are not strictly comparable. American incomes were largely actual yearly incomes from the 1901 Commissioner of Labor Survey, while English incomes were full-time equivalent annual earnings. Nonetheless, the relative incomes, as given by the index, should be independent of level. The index reflects higher relative incomes among most English professionals.Google Scholar
36 For example, all teachers in the United States had a mortality index of 1.00, while native white teachers had an index of .79, still above the .57 value for English teachers. For physicians and surgeons, the index was .97 overall and .84 for native whites, in contrast to the .43 for England and Wales.Google Scholar
37 The difference between the child mortality indices was tested for statistical significance for these selected occupational groups. To do this, several steps were necessary. First, the index values were normalized so that the national average values were 1.0000. Second, these normalized values were converted to q(5) values by multiplying them by the q(5) value in the American model table (West model, level 13, both sexes combined assuming a sex ratio of 1.05 at birth; q(5) = .19119). This basically reduced both sets of differentials to a common mortality level. Third, it was assumed that these q(5) values approximately followed a binomial process where q(5) = p and σ = , where n was number of children ever born to that occupational group. Finally, the statistical difference of these values was tested using the formula: This yielded the following t-statistics:Google Scholar
All but textile workers and native white agricultural laborers showed differences which were significant at least at a 5 percent level (two-tailed test)
38 Preston and Haines, “New Estimates of Child Mortality,” pp. 278–79.Google Scholar
39 The index of dissimilarity and the Atkinson index are already weighted.Google Scholar
40 Higher fertility, of course, promotes higher child mortality through the adverse effects of close spacing and high parity on child survival.Google Scholar
41 The effect of social class mortality rates versus the distribution of children ever born (that is, the “weights”) may be seen in the following example:Google Scholar
The use of weights reduces but does not eliminate the gap in the inequality measure. On the other hand the use of English social class child mortality rates with American weights results in a coefficient of variation (.30) far above that for the case with English weights and American rates (.11). The same is true when the 1911 English classes are used to calculate the coefficient of variation.
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50 The groups actually included were: Farmer's Sons; Officers of Local Authorities; Goldsmiths and Silversmiths; Watchmakers and Clockmakers; Bakers and Confectioners. Missing were such groups as: Coffee and Eating House Keepers; Inn and Hotel Keepers; Publicans; Boarding and Lodging House Keepers; Dealers and Merchants in various products (for example, coal, timber, wood, cork, bark, boots and shoes, corn, flour, seed); Drapers; General Shopkeepers; Grocers; Greengrocers; Tobacconists; Milksellers and Dairymen; Cheesemongers and Buttermen; Fishmongers, Poulterers and Game Dealers; Clothiers and Outfitters.Google Scholar
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52 A more precise correction for heteroscedasticity is to use the square roots of children ever born as weights. This would be less valuable in obtaining weights representative of the population. The use of square roots actually makes little difference in the final results.Google Scholar
53 Regressions were run using the two different social class groups as independent variables and three earnings variables (earnings, inverse of earnings, and log of earnings) as dependent variables for both ordinary and weighted least squares. The results, in terms of R2, ranged from .452 to .867. Only I of the 12 equations had an R2 below 0.50.Google Scholar
54 The 1950 American occupational groupings were not included in Table 5 since the 1911 English social classes performed so well.Google Scholar
55 Regressions similar to those mentioned in footnote 53 were run for England and Wales using the 1911 social class group dummies as independent variables and three earnings variables (earnings, inverse of earnings, and log of earnings) as dependent variables, using both ordinary and weighted least squares. R2 values ranged from .546 to .707.Google Scholar
56 The coefficients of variation for the mortality index in the regression models were:Google Scholar
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