Depression and anxiety cost the global economy an estimated $1 trillion in lost productivity each year, according to the World Health Organization. For companies, the cost can appear through sickness absence, weaker performance, staff turnover and difficulty retaining experienced employees. Mental health requires changes to working conditionsMany employers provide counselling, mental health education or employee assistance programmes. OECD models positive returns from some programmesThe OECD argues that workplace programmes can reduce healthcare spending and sickness absence while increasing productivity. Measuring workforce healthCompanies can track sickness absence, injuries, staff turnover, employee engagement, schedule stability and programme participation.