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. Author manuscript; available in PMC: 2014 Jan 1.
Published in final edited form as: Exp Aging Res. 2013 Jan;39(1):27–43. doi: 10.1080/0361073X.2013.741968

Table 1.

Amount of Observed and Missing Data for each of Annual Interviews

Covariate1 Baseline 1st follow-up 2nd follow-up 3rd follow-up 4th follow-up 5th follow-up 6th follow-up
Total 5888 5773 5644 5480 5301 5099 4868
Cohort Original AA Original AA Original AA Original AA Original AA Original AA Original AA
5201 687 5101 672 4988 656 4849 631 4694 607 4521 578 4316 552
Death 0 0 100 15 113 16 139 25 155 24 173 29 205 26
ADL Total 5878 5410 5127 4943 4499 4316 4269
Cohort Original AA Original AA Original AA Original AA Original AA Original AA Original AA
5192 686 4856 554 4610 517 4396 547 3985 514 3835 481 3823 446
Missing 2 9 1 245 118 378 139 453 84 709 93 686 97 493 106
Social Total 5870 5470 4660 4391 3985 0 416
Support3 Cohort Original AA Original AA Original AA Original AA Original AA Original AA Original AA
5183 687 4896 574 4660 0 4391 0 3985 0 0 0 0 416
Missing 18 0 205 98 328 0 458 0 709 0 0 0 0 136
DSST Total 5699 5249 4899 4588 4133 3887 3567
Cohort Original AA Original AA Original AA Original AA Original AA Original AA Original AA
5067 632 4737 512 4431 468 4142 446 3721 412 3499 388 3215 352
Missing 134 55 364 160 557 188 707 185 973 195 1022 190 1101 200
3MS Total 5768 5429 5107 4785 4393 4192 3839
Cohort Original AA Original AA Original AA Original AA Original AA Original AA Original AA
5082 686 4865 564 4584 523 4285 500 3921 472 3751 441 3443 396
Missing 119 1 136 108 404 133 564 131 773 135 770 137 873 156
Diabetes Total 5882 5576 5585 5442 5271 5068 4850
Cohort Original AA Original AA Original AA Original AA Original AA Original AA Original AA
5198 684 4906 670 4930 655 4812 630 4664 607 4490 578 4298 552
Missing 3 3 195 2 58 1 37 1 30 0 31 0 18 0
Arthritis Total 678 5377 5271 5365 5230 5045 4836
Cohort Original AA Original AA Original AA Original AA Original AA Original AA Original AA
0 687 4706 671 4615 656 4734 631 4623 607 4467 578 4284 552
Missing 0 0 395 1 373 0 115 0 71 0 54 0 32 0
1

CHF, CAD, and stroke had no missing values

2

Missing counts the non-decedent missingness only.

3

There is no imputation for non-observation. e.g., there is no imputed value for the social support variable in African American cohort from the 2nd to 5th follow up, as this was missing by design.

4

DSST has the largest % of missing from non-decedents for each wave of interviews: 3%, 10%, 15%, 19%, 28%, 31%, and 36%.