| Correlate as named by investigator | People investigated | |
| Finding | Have computer | 15+ Aged, general public, 164 nations, 2005-2013 |
| Finding | Informatisation | 15+ aged, general public, EU 14 member states, 1973-2001 |
| Finding | Number of telephone connections per capita | Adults, general public, 48 nations, around 1990 |
| Finding | Informatization | Adults, general public, 65 nations, 1995 and 1997 |