Reliability of the parental bonding instrument and intimate bond measure scales.

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.