Table 1: Percentage of Ecuadorian children residing at 3500-4200 meters above sea level in the Andes Mountains with specified intellectual classifications according to different test norms on the Raven Coloured Progressive Matrices (RCPM).
| RCPM Norms | ||||
| Intellectual Classification | British | United States | Puerto Rico | Peru |
| Superior | 3.2 | 0 | 7.1 | 15.4 |
| Above Average | 3.2 | 6.5 | 10.7 | 19.2 |
| Average | 9.7 | 25.8 | 28.6 | 26.9 |
| Below Average | 48.4 | 38.7 | 46.4 | 26.9 |
| Intellectual Disability | 35.5 | 29 | 7.1 | 11.5 |
The Puerto Rico and Peru columns do not total 100% because of rounding. The scores were normalized to create the percentages represented in this table.