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| Source |
Population |
#LP |
%SP |
| Tough (1971) | Cross Section of Adults | 5.0 |
68% |
| Coolican (1973) | Mothers of Preschool-aged Children | 5.8 |
66% |
| Johns (1973) | Pharmacists | 8.4 |
56% |
| Peters and Gordon (1974) | Rural and Urban Adults | 3.7 |
76% |
| Hiemstra (1975) | Cross Section of Older Adults | 3.3 |
55% |
| Baghi | ABE & GED Students | 6.6 |
57% |
| Penland (1979) | United States | 3.3 |
76% |