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Codes and Frequencies



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

00NIUXXXXX
10NoXXXXX
20YesXX···
21Responded yes··XXX
22Responded no, treated as yes (donated blood since 1985)··XXX
97Unknown-refused··XXX
98Unknown-not ascertained··XXX
99Unknown-don't knowXXXXX