Key points are not available for this paper at this time.
Richard Elardo, Robert Bradley, Bettye M. Caldwell, The Relation of Infants' Home Environments to Mental Test Performance from Six to Thirty-Six Months: A Longitudinal Analysis, Child Development, Vol. 46, No. 1 (Mar., 1975), pp. 71-76
Elardo et al. (Sat,) studied this question.