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POLABPDIFW
Time of development for new polio-related difficulty

Codes and Frequencies



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

0NIUXX
1Less than one month agoXX
2One month, but less than a year agoXX
3One year, but less than five years agoXX
4Five years, but less than ten years agoXX
510 or more years agoXX
6Other·X
8Unknown - not ascertained··
9Unknown - refused·X