Analysis of National Family Health Survey Data for 2005–06 (the most recent available dataset for analysis) shows that within India's urban population – the under-five mortality rate for the poorest quartile eight states, the highest under-five mortality rate in the poorest quartile occurred in UttarPradesh (110 per 1,000 live births), India's most populous state, which had 44.4 million urban dwellers in the 2011 censushttp://www.census2011.co.in/census/state/uttar+pradesh.html</ref> followed by Rajasthan (102), Madhya Pradesh (98), Jharkhand (90) and Bihar (85), Delhi (74), and Maharashtra (50). The sample for West Bengal was too small for analysis of under-five mortality rate. In Uttar Pradesh was four times that of the rest of the urban populations in Maharashtra and Madhya Pradesh. In Madhya Pradesh, the under-five mortality rate among its poorest quartile was more than three times that of the rest of its urban population.