Childhood
As noted by number of observers, the literature on delinquency, psychiatric conditions, mental disorders, and other childhood disorders has produced considerable knowledge on insecurity, and incompetence, and on the damage done by marital discord, prenatal rejection, and institutional rearing. Much less is known about conditions facilitating normal development or why some children with a variety of unfortunate disadvantages still manage to develop a healthy personality, emotional security and social competence. Concern with childhood mental disorders is especially appropriate in developing countries, where children under 15 years of age account for about 40 per cent of the population compared to about 25 per cent in developed countries. Poverty and low socio-economic status appear to be associated with a greater incidence of mental disorder
Adolescence
