Study Costa et al. (1981): study US 1958

Public

17-97 aged males, visitors of the Gerontology Research Centre, followed ± 10 years Baltimore, USA. 1958-70

Sample

Respondents

N = 117

Non Response

Attrition 79% at T3, mostly among psychologically least adjusted

Assessment

Questionnaire: Paper & Pencil Interview (PAPI)
Filled in during visit at Research Centre.

Correlate

Authors's Label

Thinking introversion

Our Classification

Related specification variables

Operationalization

Factor-score derived from Guilford/ Zimmerman Temperament Survey (GZTS),
by Guilford et al 1976.
Defined by restraint and thoughtfulness

Observed Relation with Happiness