Table 2.
Prevalence and group differences in SCD-plus features and SCD-I domains
| N = 205 | Sample | Chi2/F value; p value | ||||
|---|---|---|---|---|---|---|
| Total Sample | HC (n = 76) | SCD (n = 105) | Relatives of AD (n = 24) | |||
| SCD-plus features | ||||||
| Decline in memory | Yes, n (%) | 129 (62.9) | 20 (26.3) | 98 (93.3) | 11 (45.8) | 88.285***, p < .001 |
| No, n (%) | 76 (37.1) | 56 (73.7) | 7 (6.7) | 13 (54.2) | ||
| Onset of SCD in any domain within the last 5 years | Yes, n (%) | 120 (58.5) | 24 (44.5) | 85 (81.0) | 11 (45.8) | 46.088***, p < .001 |
| No, n (%) | 85 (41.5) | 52 (68.4) | 20 (19.0) | 13 (54.2) | ||
| Particular concerns/worries in any domain | Yes, n (%) | 113 (55.1) | 11 (14.5) | 95 (90.5) | 7 (29.2) | 110.351***, p < .001 |
| No, n (%) | 92 (44.9) | 65 (85.5) | 10 (9.5) | 17 (70.8) | ||
| The feeling of worse performance than others in any domain | Yes, n (%) | 35 (17.1) | 1 (1.3) | 31 (29.5) | 3 (12.5) | 25.179***, p < .001 |
| No, n (%) | 170 (82.9) | 75 (98.7) | 74 (70.5) | 21 (87.5) | ||
| Confirmation of decline in any domain by an informanta | Yes, n (%) | 81 (39.5) | 15 (39.47) | 59 (57.84) | 7 (43.75) | 25.731***, p < .001 |
| No, n (%) | 124 (60.5) | 61 (60.53) | 46 (42.16) | 17 (56.25) | ||
| Number of fulfilled SCD-plus features | M (SD) | 2.33 (1.73) | 0.9 (1.27) | 3.5 (1.08) | 1.63 (1.71) | 99.81***, p < .001 |
| SCD-I domains | ||||||
| Decline in memory | Yes, n (%) | 129 (62.9) | 20 (26.3) | 98 (93.3) | 11 (45.8) | 88.285***, p < .001 |
| No, n (%) | 76 (37.1) | 56 (73.7) | 7 (6.7) | 13 (54.2) | ||
| Decline in language | Yes, n (%) | 127 (62.0) | 28 (36.8) | 87 (82.9) | 12 (50) | 41.251***, p < .001 |
| No, n (%) | 78 (38.0) | 48 (63.2) | 18 (17.1) | 12 (50) | ||
| Decline in attention | Yes, n (%) | 62 (30.2) | 6 (7.9) | 49 (46.7) | 7 (29.2) | 31.430***, p < .001 |
| No, n (%) | 143 (69.8) | 70 (92.1) | 56 (53.3) | 17 (70.8) | ||
| Decline in planning | Yes, n (%) | 20 (9.8) | 2 (2.6) | 22 (21.0) | 2 (8.3) | 13.827***, p < .001 |
| No, n (%) | 6 (2.9) | 74 (97.4) | 83 (79.0) | 22 (91.7) | ||
| Decline in other | Yes, n (%) | 48 (23.5) | 5 (6.6) | 39 (37.1) | 4 (16.7) | 24.045***, p < .001 |
| No, n (%) | 156 (76.1) | 71 (93.4) | 65 (61.9) | 20 (83.3) | ||
| Number of reported SCD domains | M (SD) | 1.91 (1.47) | 0.80 (0.98) | 2.81 (1.17) | 1.50 (1.44) | 70.17***, p < .001 |
*p < .05
**p < .01
***p < .001
aThis refers to participants reporting a decline in at least one domain including a total of n = 156 (76.1%) individuals (HC: n = 38 (50%); SCD: n = 102 (97.1%); AD relatives n = 16 (66.7%))