More worrying statistics about the NHS today - particularly worrying as the researchers say they cannot pinpoint the reason for this.
Staffing levels over the weekend must be a big factor - we often hear stories about care which has gone wrong as a result of insufficient staffing levels overnight and during the weekend.
Babies born in hospitals in England at the weekends have a "significantly" greater chance of dying than those born on weekdays, researchers say. A study of more than 1.3 million births found there were around 7.1 deaths per 1,000 babies delivered at weekends. This was 7% higher than on weekdays. The Imperial College London team said if all days had the same death rate as Tuesday, which has the lowest, there would be 770 fewer deaths per year. The researchers said that while the death rates were low, the difference was significant and raised fresh concerns about standards of care at the weekend.