Sweden"Clear link between mental health problems experienced by pupils as a result of stress and how they feel they can perform at school," explains project leader Alexandra Björnsson.

HealthAt the end of the year, 44,500 Swedes were on sick leave due to stress-related symptoms - a multi-fold increase since 2010.

SwedenThe mental strain of working life is steadily increasing, according to figures from Statistics Sweden.

HealthNew university students were the worst affected psychologically, according to a new Swedish study.

EconomyLeads to sleep problems, mental illness and deteriorating family relations.