Key points are not available for this paper at this time.
Richard Miech, Marilyn J. Essex, H. Hill Goldsmith, Socioeconomic Status and the Adjustment to School: The Role of Self-Regulation during Early Childhood, Sociology of Education, Vol. 74, No. 2 (Apr., 2001), pp. 102-120
Miech et al. (Sun,) studied this question.