- 50+ aged males, fulltime employed at T1, followed ten years, Iowa, USA, 1964-74
- N = 1870
- Non Response:
- T1 refusals: 8% T1-T2 drop-out: 29%, of which 20% deceased
- Interview: face-to-face
- Authors's label
- Our Classification
- 5 item index concerning sense of belonging to others and society.