Cost of living our biggest worry, says National Australia Bank Consumer Anxiety Index Anxiety can lead to increased heart issues. THE cost of living is the single biggest source of anxiety, according to new research. The National Australia Bank quarterly Consumer Anxiety Index puts concern about the cost of living at 7.4 out of 10, ahead of "government policy" at 7.1 and "ability to fund retirement" at 6.6. Health scored 5.6 and job security was the source of least concern, at 4.8, where 0 is "not at all concerned" and 10 is "extremely concerned." More than 40 per cent of the 1000 Australians surveyed rated their concern in regards to the cost of living at nine or more out of 10. Queenslanders were most worried about the cost of living; Tasmanians were least concerned. "Consumers in all states were most anxious about cost of living, especially Queensland," said NAB chief economist Alan Oster. Consumer anxiety about the cost of living was highest among those earning $35,000 to $50,000, followed by those on $75,000 to $100,000. How is the cost of living affecting you? Email john.rolfe@news.com.au Follow John Rolfe on Twitter @costofliving