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Codes and Frequencies



An 'X' indicates the category is available for that sample

0NIUXX
1Eyeglasses onlyXX
2Contact onlyXX
3Hearing aid onlyXX
4Eyeglasses and contactsXX
5Eyeglasses and hearing aidXX
6Contacts and hearing aidXX
7Eyeglasses and contacts and hearing aidXX