Frequencies for first 10,000 rows of agefl variable in nhamcsed2015 dataset :

Was patient age reported, calculated or |
                               imputed? |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
Age calculated by NCHS based on imputed |          4        0.04        0.04
Age calculated by NCHS based on reporte |      9,991       99.91       99.95
Age entered in survey instrument withou |          5        0.05      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 20 Nov 2017