Table 1 Descriptive statistics
From: Midlife perceived stress is associated with cognitive decline across three decades
Variable | N | Mean (SD) or N (%) | Correlation with young adult Verbal IQ | Correlation with midlife Verbal IQ | Correlations with young adult Performance IQ | Correlation with midlife Performance IQ |
|---|---|---|---|---|---|---|
Sex (F = 1/M = 0) | 292 | 146 (50%) | −0.22*** | − 0.19** | − 0.05 | −0.02 |
Midlife test age | 292 | 56.45 (0.76) | 0.20*** | 0.18** | 0.14* | 0.13* |
Young adult test age | 292 | 27.34 (4.24) | 0.07 | 0.04 | 0.00 | −0.01 |
Retest interval, years | 292 | 29.11 (4.05) | −0.03 | − 0.00 | 0.02 | 0.04 |
Midlife perceived stress | 292 | 10.19 (6.98) | −0.29*** | − 0.28*** | − 0.15** | − 0.26*** |
Young adult neuroticism | 292 | 7.37 (4.87) | −0.31*** | − 0.25*** | − 0.09 | − 0.11 |
Midlife neuroticism | 290 | 5.67 (5.05) | − 0.23*** | −0.15** | − 0.07 | −0.16** |
Change in neuroticism | 290 | −1.68 (4.52) | 0.03 | 0.01 | 0.02 | −0.08 |
Education | 291 | 11.12 (1.59) | 0.57*** | 0.56*** | 0.37*** | 0.35*** |
Parental SEP | 253 | 4.83 (1.85) | 0.39*** | 0.46*** | 0.16* | 0.20** |