1. A method of associating healthcare records in healthcare databases with an individual, comprising: locating at least one attribute type in a first record of a first database and one or more similar attribute types in one or more other records of one or more other databases different from the first database, the at least one attribute type being associated with the individual; comparing the at least one attribute type and each of the one or more similar attribute types; in response to comparing the at least one attribute type and each of the one or more similar attribute types, determining, based on the comparison, a first weighted score for each one of the at least one attribute type in the first record and another weighted score for each one of the one or more similar attribute types in the one or more other records, wherein a weighted score for a particular attribute type indicates a likelihood that the particular attribute type is associated with a same individual as at least one other attribute type located in another record, and wherein a weighted score for a particular attribute type further accounts for a time delta between measurements of the particular attribute type in a particular record and measurements of one or more similar attribute types in one or more other records; and calculating a first confidence score output for the first record and one or more other confidence score outputs for each of the one or more other records, wherein a confidence score output of a record is based on all weighted scores of that record and indicates a likelihood that record is associated with the same individual.