Table 3. Bias in mean level of cognition, by wave of follow-up, HRS cohorts compared with ELSA (using baseline weights).
| Entry Cohort | Follow-up Wave | |||||||
|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | |
| HRS 92 | 0.05 | 0.07 | 0.06 | 0.06 | 0.05 | 0.05 | 0.04 | 0.04 |
| AHEAD | 0.03 | 0.02 | 0.01 | 0.00 | 0.04 | 0.06 | 0.08 | |
| CODA | -0.01 | 0.04 | 0.00 | 0.03 | 0.03 | |||
| WB | 0.07 | 0.09 | 0.06 | 0.06 | 0.06 | |||
| EBB | 0.08 | 0.08 | ||||||
| All HRS | 0.05 | 0.06 | 0.04 | 0.04 | 0.05 | 0.06 | 0.05 | 0.04 |
| ELSA | 0.20** | 0.21** | ||||||
| ELSA-HRS | 0.15** | 0.15** | ||||||
Notes: Bias is measured as the difference in mean baseline cognition score between responders in a follow-up wave and all survivors to the date of the follow-up wave, using baseline sampling weights. For abbreviations, see notes to Table 1. Estimates in bold are greater than zero at P<.05 significance level in a one-tailed test; estimates with
*
are significant at p<.01, and
**
at p<.001.