Macquarie Bank appears to have suffered huge outflows from its mortgage and household deposit books, based on figures published by the Australian Prudential Regulation Authority last week.However, a Macquarie spokesperson said the bank had made a number of changes to the way it reports its data to achieve a better alignment with APRA classifications.APRA's latest monthly banking statistics show a drop in the book value of Macquarie mortgages, from A$12.1 billion in February to $11.1 billion in March.Macquarie has moved a number of loans from the owner-occupied category to "other", based on the loan's purpose. For example, a loan secured by a mortgage over a home that was used to buy a boat has moved to "other".Macquarie said its total mortgage lending increased from $12.1 billion in February to $12.3 billion in March.The APRA figures show Macquarie's household deposits falling from $7.5 billion to $5.5 billion. The big change was the re-classification of self-managed superannuation fund deposits, which moved from household deposits to "financial corporations".Macquarie's total deposits increased from $33.9 billion in February to $34.2 billion in March.