The coronavirus proved substantially deadlier to people of color under the age of 65 than to their white counterparts in the early days of the pandemic, an in-depth analysis released Friday found. The report from the Centers for Disease Control and Prevention is the agency’s most comprehensive analysis of the demographics of those who died of covid-19, the disease caused by the novel coronavirus. Researchers analyzed data for about 52,000 confirmed deaths between mid-February and mid-April. Most of the people who died were older than 65, and most had underlying medical conditions. But researchers obtained more complete data on race, ethnicity and underlying conditions for a subset of about 10,000 people. Most of those deaths occurred in New York City, New Jersey and Washington state, three areas hardest hit at the dawn of the pandemic.