Table 4.
Predicted Means for Backward Digit Span in the PSID-CDS.
| Age | Mean | SE | LCI | UCI |
|---|---|---|---|---|
|
| ||||
| 3 | −0.90 | .10 | −1.11 | −0.70 |
| 4 | 0.25 | .07 | 0.11 | 0.38 |
| 5 | 1.26 | .05 | 1.17 | 1.36 |
| 6 | 2.15 | .04 | 2.07 | 2.24 |
| 7 | 2.93 | .04 | 2.84 | 3.01 |
| 8 | 3.59 | .04 | 3.50 | 3.68 |
| 9 | 4.16 | .04 | 4.08 | 4.24 |
| 10 | 4.64 | .04 | 4.56 | 4.72 |
| 11 | 5.04 | .04 | 4.96 | 5.12 |
| 12 | 5.37 | .04 | 5.28 | 5.46 |
| 13 | 5.64 | .05 | 5.54 | 5.74 |
| 14 | 5.86 | .05 | 5.76 | 5.96 |
| 15 | 6.04 | .05 | 5.93 | 6.15 |
| 16 | 6.19 | .06 | 6.07 | 6.31 |
| 17 | 6.32 | .07 | 6.18 | 6.46 |
| 18 | 6.43 | .10 | 6.23 | 6.64 |
| 19 | 6.55 | .15 | 6.24 | 6.85 |
Note: Estimates were calculated by running a weighted multilevel model where age was a cubic function. Missing data were handled using multiple imputation.