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CXRAY135YRR
Time since last chest xray: Grouped year recode

Codes and Frequencies



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

0NIUX
1Within the past yearX
21 to 3 years agoX
3Over 3 years agoX
4Under 3 years, specific unkX
5Assume over 3 years, specific unkX
8Unknown-not ascertained·
9Unknown-don't knowX