Table 1.
Descriptive statistics.
| N | (%) | Social Engagement (Range −0.79, 1.09) |
(SD) | Total brain volume (Range 880.6, 1449.3) |
(SD) | |
|---|---|---|---|---|---|---|
| All | 348 | (100%) | 0.01 | (0.33) | 1137.4 | (100.4) |
| Age | ||||||
| 48–59 | 82 | (23.6%) | −0.07 | (0.35) | 1187.5 | (94.6) |
| 60–64 | 92 | (26.4%) | 0.04 | (0.32) | 1161.3 | (90.6) |
| 65–69 | 84 | (24.1%) | 0.02 | (0.29) | 1123.9 | (81.8) |
| 70–82 | 90 | (25.9%) | 0.07 | (0.33) | 1079.7 | (100.4) |
| P = 0.028 | P < 0.001 | |||||
| Race/ethnicity | ||||||
| White/Non-Hispanic | 315 | (90.5%) | 0.02 | (0.32) | 1141.6 | (99.9) |
| All other | 33 | (9.6%) | −0.05 | (0.40) | 1097.1 | (97.9) |
| P = 0.25 | P = 0.015 | |||||
| Educational attainment | ||||||
| <High school | 25 | (7.2%) | −0.05 | (0.41) | 1083.1 | (74.7) |
| High school | 90 | (25.9%) | −0.05 | (0.32) | 1139.8 | (97.4) |
| High school + trade school | 167 | (48.0%) | 0.03 | (0.30) | 1135.8 | (101.6) |
| College degree | 56 | (16.1%) | 0.04 | (0.34) | 1171.6 | (92.2) |
| Graduate degree | 10 | (2.9%) | 0.28 | (0.41) | 1086.1 | (137.9) |
| P = 0.018 | P = 0.002 | |||||
| Hypertension | ||||||
| Yes | 180 | (51.7%) | 0.01 | (0.32) | 1116.6 | (97.5) |
| No | 168 | (48.3%) | 0.01 | (0.33) | 1159.6 | (99.0) |
| P = 0.97 | P < 0.001 | |||||
| Diabetes | ||||||
| Yes | 54 | (15.5%) | −0.01 | (0.29) | 1098.8 | (90.5) |
| No | 294 | (84.5%) | 0.02 | (0.34) | 1144.4 | (100.7) |
| P = 0.59 | P = 0.002 | |||||
| Control status | ||||||
| Population-based control | 43 | (12.4%) | 0.12 | (0.29) | 1103.5 | (100.5) |
| Former lead worker | 305 | (87.6%) | 0.00 | (0.33) | 1142.1 | (99.6) |
| P = 0.018 | P = 0.018 |
All P-values from analysis of variance (ANOVA) tests.