Table 2.
Comparison of demographic variables by group
| Demographic variables | EFAa (N = 250) | CFAb (N = 149) | t* | p-Value** |
|---|---|---|---|---|
| Age (years) | ||||
| M | 61.28 | 61.79 | −.70 | .48 |
| SD | 7.03 | 6.39 | ||
| Range | ||||
| WASI (verbal IQ)c | ||||
| M | 112.30 | 112.70 | −.392 | .69 |
| SD | 9.64 | 9.84 | ||
| Range | ||||
| Education (years) | ||||
| M | 16.21 | 16.28 | −.24 | .81 |
| SD | 2.58 | 2.92 | ||
| Range | ||||
| WRAT-3 Readingd | ||||
| M | 108.07 | 112.70 | −.06 | .95 |
| SD | 8.89 | 9.84 | ||
| Range | ||||
| Female | ||||
| N | 165 | 103 | .414 | .52 |
| % | 69.1 | 66.0 | ||
| AD family history | ||||
| N | 81 | 70 | 8.44 | .004 |
| % | 32.4 | 47.0 | ||
aExploratory factor analysis. bConfirmatory factor analysis. *For categorical variables, the Pearson Chi-Square statistic was used. **All p-values were compared to Bonferroni-adjusted α = .0083. cWechsler Abbreviated Scale of Intelligence (Wechsler, 1999). dWide Range Achievement Test-3 (Wilkinson, 1993).