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Sex Ratios in the 2003 through 2006 ACS Single-Year and Multiyear Public Use Microdata Sample (PUMS) files

UPDATE: The 2006 ACS 1-year PUMS files were re-released on December 18, 2009. See Errata Note #50 for details.

Disclosure avoidance techniques were applied to the 2003 through 2006 ACS 1-year PUMS files to protect the confidentiality of responses. One of these techniques resulted in some inconsistent ratios for the number of men to the number of women (sex ratio) for people age 65 and over. Table 1 below displays 2006 ACS data from Detailed Table B01001 (Sex by Age) for ages 60 and over for the nation and the corresponding data from the 2006 PUMS file. An example of the inconsistency is shown in the 65-66 age group, where the sex ratio estimate is 88, but the ACS PUMS data indicate a sex ratio estimate of 98. The disclosure avoidance technique has been modified to avoid this distortion of age data in future releases of the ACS PUMS files.

Table 1. 2006 ACS — National

  Detailed Table B01001 PUMS
Age Group Male Female Sex Ratio Male Female Sex Ratio
60 and 61 years 2,697,559 2,918,530 92 2,706,706 2,910,160 93
62 to 64 years 3,773,329 4,179,658 90 3,777,403 4,170,440 91
65 and 66 years 2,096,170 2,382,333 88 2,135,698 2,176,246 98
67 to 69 years 2,745,928 3,146,519 87 2,729,950 3,305,076 83
70 to 74 years 3,835,107 4,730,629 81 3,789,906 4,739,463 80
75 to 79 years 3,168,881 4,323,137 73 3,130,906 4,301,794 73
80 to 84 years 2,210,627 3,544,895 62 2,224,316 3,553,166 63
85 years and over 1,549,962 3,456,816 45 1,602,828 3,504,538 46

The sex ratio inconsistencies may continue to be seen in any multiyear PUMS files that include the 2005 or 2006 ACS 1-year PUMS, since for the time being, these files remain unmodified due to disclosure risks. This includes the 2005-2007, 2006-2008, 2005-2009, and 2006-2010 Multiyear ACS PUMS files. Table 2 below displays 2005-2007 ACS 3-year data from Detailed Table B01001 (Sex by Age) for ages 60 and over for the nation and the corresponding data from the 2005-2007 ACS 3-year PUMS file. Again, looking at the 65-66 age group, the sex ratio estimate is 88, but the ACS PUMS data indicate a sex ratio estimate of 95.

Table 2. 2005-2007 ACS — National

  Detailed Table B01001 PUMS
Age Group Male Female Sex Ratio Male Female Sex Ratio
60 and 61 years 2,818,664 3,043,113 93 2,814,489 3,043,093 93
62 to 64 years 3,755,146 4,134,836 91 3,761,936 4,136,284 91
65 and 66 years 2,107,291 2,385,729 88 2,132,081 2,254,679 95
67 to 69 years 2,750,719 3,174,849 87 2,739,532 3,265,054 84
70 to 74 years 3,847,793 4,722,629 82 3,814,172 4,726,550 81
75 to 79 years 3,188,205 4,344,880 73 3,162,983 4,325,507 73
80 to 84 years 2,212,983 3,554,244 62 2,214,522 3,554,766 62
85 years and over 1,542,871 3,432,917 45 1,583,384 3,471,096 46

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