Table 1.
The frequency of missingness for cognitive variables for the 2001, 2003, 2012, and 2015 observation waves of the Mexican Health and Aging Study
| Observation Wave | ||||
|---|---|---|---|---|
| Task, n (%) | 2001 (n=13,962) |
2003 (n=12,495) |
2012 (n=14,448) |
2015 (n=13,850) |
| Immediate word recall | 568 (4.07) | 367 (2.94) | 417 (2.89) | 128 (0.92) |
| Delayed word recall | 568 (4.07) | 367 (2.94) | 468 (3.24) | 141 (1.02) |
| Copy figure | 1365 (9.78) | 1573 (12.6) | 1332 (9.22) | 982 (7.89) |
| Copy figure, delay | 1476 (9.85) | 1706 (13.7) | 1510 (10.5) | 1093 (7.89) |
| Visual scanning | 1315 (9.42) | 912 (7.30) | 1370 (9.48) | 992 (7.16) |
| Date naming | --- | 4 (0.03) | 352 (2.44) | 83 (0.60) |
| Animal naming | --- | --- | 428 (2.96) | 120 (0.87) |
| Counting backwards | --- | --- | 1005 (6.96) | 692 (5.00) |
| Serial 7s | --- | --- | --- | 4929 (35.6) |
| *Total score | 1715 (12.28) | 1889 (15.1) | 2164 (15.0) | 5255 (37.9) |
The scoring range for the copy figure and copy figure delay tasks was from 0-2 points in 2001 and 2003 and from 0-6 points in 2012 and 2015.
*
Participants who had missing data for one or more cognitive tasks were classified as missing for the total score.