The S&P/Case-Shiller Home Price Indices include tiered indices for 17 of the 20 cities which show how prices for low-price, mid-price and high-price homes compare. The table shows the percentage change over the 12 months ending in March 2011 for the three tiers for each city covered. The red number in each row is the lowest for that row. More often than not, the price index with the largest drop is the one for the low price homes. Two related factors that account for the weaker results for lower priced houses are sub prime mortgages and foreclosures. Many of the more infamous mortgage practices were among the lower priced houses and, as a result, foreclosures tend to concentrate in the same segment.