Breakdown by category of IFO and case quality

BBSR further broke these results down based on whether the identification was considered certain or merely doubtful. For example, in both the astronomical and aircraft IFO categories, 12% were considered certain and 9% were doubtful. Overall, of the 69% listed as IFOs, 42% were thought to be solved with certainty, while 27% were still considered doubtful.

In addition, if a case was lacking in adequate data, it was placed in the insufficient information category, separate from both IFOs and UFOs.