Sales activity in the first four months of this year indicates that Southern California is still in a real estate slump.

Sales, including single-family homes and condominiums, dropped more than 19% from the year-earlier level in a six-county region, according to TRW Redi Property Data, a real estate research group in Riverside, Calif.

The largest decline - 32% - occurred in San Diego County.

The least affected market was entry-level homes, which tend to cost less than $100,000. Those homes account for 12% of all home sales in Southern California, according to the research firm. Home sales in this price range increased 1%.

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