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The long-term reliability of the Parental Bonding Instrument (PBI) and of the Intimate Bond Measure (IBM) are examined in a non-clinical group, with data being examined over eleven and five years for the two respective measures. Such reliability data are compared with reliability data on a number of personality measures within the same cohort. Results demonstrate considerable stability in the PBI over an extended period and moderate stability in IBM scores.
Wilhelm et al. (Fri,) studied this question.