“…We included clerks in the "low grade" group because their levels of income, job authority, and job prestige are low and comparable to manual workers" (Melchior, Niedhammer, Berkman & Goldberg, 2003). Similarly, the unemployed and men and women excluded from the labour force are characterized by low income and low social standing, and we also included them in the "low grade" group (Desplanques, 1984;Bartley, Sacker & Clarke, 2004). Additionally, for father"s occupation, the "low grade" group included participants who reported that their father was unknown to them or had died before they reached the age of 15.…”