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ResMed CPAP machines round the length of each session to the nearest minute, then adds those together to get the total minutes for the night. OSCAR doesn't round the session lengths and thus computes the total time for the night in seconds. AHI is calculated as # events/total time, so OSCAR and the machine are using a slightly different denominator for total time.
== OSCAR "unable to write to Oscar directory" at startup ==
'''Description:''' OSCAR terminates with an error message "unable to write to OSCAR directory" at startup.
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'''Possible fault mechanism:''' Either an anti-virus or other security program is preventing OSCAR from writing to disk or permissions are set incorrectly on some folders.
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'''Solution or workaround:''' Specify that OSCAR is an allowed program in your anti-virus or security program. If permissions in Documents or OSCAR_Data directories are not set to allow writing, change the security settings so that writing is allowed.
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OSCAR 1.2.0 added a test at startup to check that it could properly write data to your OSCAR_Data directory. Previous versions of OSCAR would stumble through and give partial results but not write data to the OSCAR database.
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