Table 5.

Results From Multiple Imputation for Model 1, Predicting IRT-Based CASI Scores^a

Covariate	Coefficient (95% CI)
(Intercept)	79.62 (75.21 to 84.04)
Examination 1 language use
Spoke but did not read Japanese	0 (reference)
Neither spoke nor read Japanese	2.01 (−0.93 to 4.96)
Both spoke and read Japanese	−0.52 (−3.48 to 2.44)
Age at Examination 4	−10.94 (−16.34 to −5.55)
Education (y)	2.94 (2.26 to 3.62)
Education2 (y)	−0.073 (−0.10 to −0.04)
Annual income at Examination 4 ($)
<15,000	0 (reference)
15,000–19,999	2.43 (1.00 to 3.85)
20,000–29,999	3.70 (2.25 to 5.16)
≥30,000	5.06 (3.72 to 6.41)
Smoking status at Examination 4
Never	0 (reference)
Past	0.52 (−0.27 to 1.31)
Current	−0.60 (−2.18 to 0.98)
0 APOE ϵ4 alleles	0 (reference)
1 or 2 APOE ϵ4 alleles	−1.27 (−2.27 to −0.28)
No. of test taken
1st	0 (reference)
2nd	−6.92 (−8.5 to −5.34)
3rd	−12.14 (−15.39 to −8.90)
4th	−13.92 (−18.14 to −9.69)
Age	4.78 (−1.77 to 11.32)
Age2	−0.89 (−2.60 to 0.81)
Age × Examination 1 language use
Spoke but did not read Japanese	0 (reference)
Neither spoke nor read Japanese	−2.32 (−8.52 to 3.89)
Both spoke and read Japanese	−0.46 (−6.32 to 5.40)
Age2 × Examination 1 language use
Spoke but did not read Japanese	0 (reference)
Neither spoke nor read Japanese	1.48 (−1.65 to 4.60)
Both spoke and read Japanese	0.079 (−2.62 to 2.78)

Note: APOE = apolipoprotein E; CASI = Cognitive Abilities Screening Instrument; CI = confidence interval; IRT = item response theory.

^aAge effects are for 10 years, centered at age 70.