Quality of Life in Singapore, Singapore

I don't understand how the quality of life index is computed.
Singapore has four green indices, three red indices and 1 yellow index. Shanghai has exactly the same. However, two of Shanghai's green indices are "VERY", meaning very good scores while Singapore has none of the very good scores. Yet, Singapore's quality of life index is 156.27 (Apr 2024) compared to 97.86 of Shanghai.
This is contrary to my own experiences. I had been living in Singapore for 15 years and Shanghai for 3 years. My quality of living in Shanghai is much higher than in Singapore. I was not born in either of the two cities, but I am a permanent resident of Singapore and have Shanghai Hukou (can be regarded as new Shanghainese). So my experiences in both cities should be a fair comparison. Singapore is very expensive for the amount of salary you can get. Shanghai pays about the same as Singapore (for middle management level and above) while having much much lower living costs. If not for career advancement within the group (Shanghai headquarter is too competitive while Singapore subsidiary has almost no competition), I would not choose to relocate to Singapore this time.

It's a great place to be ! Been living in all the typical expat cities around the globe, but prefer it here in the end.

Singapore is known for having extremely low crime rates. The fact that people are claiming otherwise only proves that you cannot trust this site.

People need to simply understand that housing prices are high because Singapore is a city state and does not have land to build low density suburbia. Anyways, the city is similar to European cities and that you don't need a car to get around. Public transport is WAY cheaper here compared to other cities. Eating at restaurants is said to be expensive, but it is cheaper than in London or Paris.

The PAP may be the ruling party but looking at the 2020 General Elections, they lost the youth vote and their strategies of carving out new districts to help them haaad backfired. There is also a major power struggle between who will succeed Lee Hsien Loong. This shows that the PAP are shooting themselves in the foot and allowing the opposition to catch up to them.

Basically to summarise, Singapore's expensiveness lies in breaking the middle class barrierto become upper class. The poorest of the poor here still have roofs over their heads, good healthcare and still eat 3 meals a day thanks to government subsidies for the poor. The ruling party is also starting to fall apart and in 20 years' we might be able to see an opposition majority if the PAP do not rebuild themselves