Add AHI variables from TB

[mrueschman]

Per YZ:

Am working on creating the ICSD3 definition for OSA for MrOS. Here are a list of variables I found and what I could not find. Would appreciate you taking a look.

• Apnea hypopnea index 3%: any apneas + hypopneas with 3% oxygen desaturation (pordi3p - overall RDI at 3% desaturation)
• Apnea hypopnea index 3%: any apneas + hypopneas with 3% oxygen desaturation or arousal (pordi3pa - overall RDI at 3% desaturation or arousal)
• Apnea hypopnea index 4%: any apneas + hypopneas with 4% oxygen desaturation (pordi4p overall RDI at 4% desaturation)

•    Apnea hypopnea index 4%: any apneas + hypopneas with 4% oxygen desaturation or arousal (pordi4pa - overall RDI at 4% desaturation or arousal)

• Obstructive apnea hypopnea index 3%: any obstructive apneas + hypopneas with 3% oxygen desaturation (poordi3 - obstructive apnea [all desaturations] hypopnea [3% desaturation] index)

• Obstructive apnea hypopnea index 3%: any obstructive apneas + hypopneas with 3% oxygen desaturation or arousal (could not find corresponding variable)
• Obstructive apnea hypopnea index 4%: any obstructive apneas + hypopneas with 4% oxygen desaturation (poordi4 - obstructive apnea [all desaturations] hypopnea [4% desaturation] index)

•    Obstructive apnea hypopnea index 4%: any obstructive apneas + hypopneas with 4% oxygen desaturation or arousal (could not find corresponding variable)

•    Central apnea hypopnea index 3%: any central apneas + hypopneas with 3% oxygen desaturation (could not find corresponding variable)

• Central apnea hypopnea index 3%: any central apneas + hypopneas with 3% oxygen desaturation or arousal (could not find corresponding variable)
• Central apnea hypopnea index 4%: any central apneas + hypopneas with 4% oxygen desaturation (could only find pocai4p which is the central apnea index 4% desaturation – but could not find corresponding variable that includes apneas and hypopneas)

•    Central apnea hypopnea index 4%: any central apneas + hypopneas with 4% oxygen desaturation or arousal (could only find pocai4pa which is the central apnea index 4% desaturation or arousal – but could not find corresponding variable that includes apneas and hypopneas)

•    Central/obstructive apnea index ratio (pocai0p – central apnea index all desaturations and pooai0p – obstructive apnea index all desaturations).

[mrueschman]

New data generated by TB with NSRRIDs. Add these new source variables.