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Summary The social conditions of the 212 families participating in the longitudinal study during the children's first three years of life are described with reference to 23 tables and 2 figures in respect of housing standard, education, occupation and income. The material is classified under each of these variables on a 5‐grade scale in accordance with an international social grouping system (Graffar). The aggregate values of the different variables are considered to reflect the socio‐economic level of the family.
Klackenberg et al. (Sun,) studied this question.
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