Table 2.
Distribution of variables among participants without and with missing values (100%: n=849)
| No missings | ≥ 1 missing | p1 | ||
|---|---|---|---|---|
| (n = 389; 45.8%) | (n = 460; 54.2%) | |||
| ApoE e4 status (% carrier) | 40.6% | 36.3% | .203 | |
| Age (mean (SD)) | 68.0 (7.1) | 70.5 (7.8) | < .001 | |
| Sex/gender (% women) | 80.5% | 79.8% | .863 | |
| Education (% <= high school) | 29.8% | 46.7% | < .001 | |
| Testing site (%) | Columbia University | 82.0% | 23.7% | < .001 |
| NC A&T University | 7.7% | 22.6% | ||
| University of Miami | 5.1% | 33.7% | ||
| Vanderbilt University | 5.1% | 20.0% | ||
| Diagnosis (%) | Normal | 745% | 62% | .001 |
| Amnestic MCI | 13.1% | 21.35% | ||
| Non-amnestic MCI | 9.3% | 10.9% | ||
| Impaired, not MCI | 3.6% | 5.9% | ||
| CVLT verbal learning score (mean (SD)) | .116 (1.009) | −.103 (.982) | .002 | |
| CVLT memory retention (mean (SD)) | .129 (.898) | −.114 (1.070) | < .001 | |
| Logical Memory recall (mean (SD)) | .195 (.963) | −.218 (.997) | < .001 | |
| Logical Memory retention (mean (SD)) | .063 (.935) | −.072 (1.065) | .068 | |
| Digit Span Backward (mean (SD)) | .073 (1.017) | −.081 (.976) | .037 | |
| ROCF recall (mean (SD)) | .103 (.994) | −.368 (.937) | < .001 | |
| ROCF retention (mean (SD)) | .036 (1.102) | −.133 (.441) | .121 | |
| Semantic fluency (mean (SD)) | .12 (.998) | −.104 (.991) | .001 | |
| BNT (mean (SD)) | .205 (.814) | −.229 (1.132) | < .001 | |
| Trail Making Test (mean (SD)) | −.142 (.967) | .184 (1.013) | < .001 | |
| Letter fluency (mean (SD)) | .115 (.978) | −.129 (1.010) | .001 | |
| Digit Symbol (mean (SD)) | .248 (.944) | −.282 (.988) | < .001 | |
| WRAT-3 (mean (SD)) | 45.43 (5.88) | 44.35 (7.29) | .021 | |
Note.
1
Calculated with chi-square tests and t-tests;
CVLT = California Verbal Learning Test; ROCF = Rey-Osterrieth Complex Figure; BNT = Boston Naming Test; WRAT-3 = Wide Range Achievement Test 3; all cognitive scores were standardized.