Crowded, busy and always awake, Wan Chai is by far the city's happiest district, according to a survey compiled by Lingnan University. On a scale of zero to 10 (with 10 the most happy), Wan Chai scores 8.55, well ahead of second-placed Tai Po on 7.69 and exceeding the city's overall average of 7.11 - for reasons not entirely clear to the annual study's compiler. 'It must have some something to do with the wealth of Wan Chai residents, but we can't find out exactly why from this study,' said Professor Ho Lok-sang, of the university's Centre for Public Policy Studies. Easier to explain was the score for Kwai Tsing, whose 6.83 makes it the city's unhappiest district, slightly below Wong Tai Sin's 6.87. These two areas, said Ho, were clearly among the city's poorer districts. In general, Hong Kong Island's residents are happier than those of Kowloon and the New Territories, despite the high score for Tai Po in the latter. Insurance firm ING Life collaborated in compiling the survey, in which more than 8,500 people were asked to rate their happiness. Respondents were allowed to decide for themselves what happiness was, rather than being given a definition. As a whole, Hongkongers had a happiness index of 71.1 this year, on a scale of zero to 100, continuing a gentle upward trend since 2007. As in previous years, women were generally happier than men until they reached 50, when single women rapidly became less happy and sadder than men at the same age. The level of education was inversely proportional to happiness: graduates had a happiness level of 7.11, lower than those with only primary school education or those who had not gone to school at all. Although the less educated are likely to be older people, who are generally happier than younger age groups, 'the negative effect of education on happiness is robust and remains significant', Ho said. As for accommodation, owners of Home Ownership Scheme dwellings live in the happiest households. Those living in private homes are the second happiest group, and public housing tenants the least happy. 'On this basis, I urge the government to seriously consider resuming the [HOS] scheme, so more people will be happier,' Ho said. Ho said the government should begin to consider happiness when devising policy, instead of only considering the gross domestic product, because 'happiness is really a way of life. But a GDP-oriented approach is too calculated sometimes, putting people under pressure'.