About 18% of the men and 30% of the women in Kolkata are obese—the majority of them belonging to the non-poor strata of society.[1]: 105 In 2005, Kolkata had the highest percentage (55%) among the surveyed cities of anaemic women, while 20% of the men in Kolkata were anaemic.[133]: 56–57 Diseases like diabetes, asthma, goitre and other thyroid disorders were found in large numbers of people.[133]: 57–59 Tropical diseases like malaria, dengue and chikungunya are prevalent in Kolkata, though their incidence is decreasing.[201][202] Kolkata is one of the districts in India with a high number of people with AIDS; it has been designated a district prone to high risk.[203][204] As of 2014, because of higher air pollution, the life expectancy of a person born in the city is four years fewer than in the suburbs.[205]