The human development index has some correlation with income, which promotes access to marijuana use. (scientificamerican.com)
Measures used included the Mental Development Index subscale of the Bayley Scale of Infant Development - II (BSID - II), the emotionality scale of the Buss and Plomin Emotionality, Adaptability, and Sociability Inventory (EASI - II), and the Home Observation for Measurement of the Environment (HOME). (cebc4cw.org)
The passport ranking is based on the Visa - Free Score, the Visa - Free portion and the United Nations Development Programme Human Development Index of all countries. (ghanapoliticsonline.com)