Table 1.
Demographic characteristics and episodic memory scores
| All participants | Asymptomatic | Symptomatic | p-values | |
|---|---|---|---|---|
| (N = 139) | (N = 85) | (N = 54) | ||
| Age (mean, sd) | 43.6 (10.9) | 38.5 (10.1) | 52.2 (4.6) | <0.001 |
| Female sex, n (%) | 64 (46) | 37 (43.5) | 27 (50) | 0.456 |
| Severity of ID, n (%) | 0.288 | |||
| Mild | 46 (33.1) | 31 (36.5) | 15 (27.8) | |
| Moderate | 93 (66.9) | 54 (63.5) | 39 (72.2) | |
| Time between MRI and mCRT, days (mean, sd) | 108.2 (81.4) | 116.2 (79.0) | 95.5 (84.2) | 0.088 |
| mCRT scores (mean, sd) | ||||
| Trial 1 free recall (0–12) | 4.3 (2.3) | 5.4 (1.9) | 2.5 (1.7) | <0.001 |
| Trial 3 free recall (0–12) | 5.8 (2.9) | 7.7 (1.7) | 2.7 (2.6) | <0.001 |
| Free immediate recall score (0–36) | 15.3 (7.4) | 19.8 (4.7) | 7.7 (5.3) | <0.001 |
| Total immediate score (0–36) | 29.5 (9.3) | 35 (1.6) | 20.7 (9.9) | <0.001 |
| Free delayed recall score (0–12) | 5 (3.5) | 6.8 (2.7) | 1.7 (2.4) | <0.001 |
| Total delayed score (0–12) | 9.7 (3.3) | 11.5 (1.0) | 6.3 (3.6) | <0.001 |
p values are given for comparison between asymptomatic and symptomatic subjects. Age refers to the age recorded on the day of the mCRT administration. Brackets next to each episodic memory measure reflect the total possible range of scores
ID Intellectual disability, mCRT Modified Cued Recall Test