| Public | Population Number of respondents
| Author(s) |
| Students | Students, Singapore, 1985 N = 256 | Michalos, A.C. |
| Students | Students, Singapore, 1985 N = 256 | Michalos, A.C. |
| Students | Students, Singapore, 1995 N = 131 | Diener, E. |
| Students | Students, Singapore, 1995 N = 130 | Diener, E. |
| Students | University students, Singapore, 1991 N = 256 | Diener, E.; Diener, M. |