A state can place a return under manual review status for a variety of reasons, but typically it is just to confirm the identity of the filer, as several users have noted.
If Ohio has further questions after their review, they may issue a letter. See here for more information.
Even if you filed your federal and state returns at the same time, your state may not start processing your state return at the same time as the IRS processes the Federal return. Your state return may remain in pending status several days after your federal return has been accepted. Please see this TurboTax help article for more information.
Please also see this TurboTax article for information and links to check on the status of state returns for the different states.
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