Table 1.
Differences in mean reaction time (RT) and intra-individual variation in reaction time (IIV) at follow-up according to socioeconomic and lifestyle factors. Values are means and (standard deviations)
| Variable | RT (ms) | IIV |
|---|---|---|
| Age (years) | ||
| 40–52 | 512.76 (95.25)*** | 68.53 (49.38)*** |
| 53–59 | 551.78 (102.18) | 77.15 (55.23) |
| 60–63 | 571.90 (110.04) | 82.27 (58.56) |
| 64+ | 594.67 (114.15) | 88.95 (66.03) |
| Gender | ||
| Females | 562.51 (109.01)*** | 79.80 (59.02) |
| Males | 548.80 (108.74) | 77.40 (55.70) |
| Education | ||
| No degree | 564.44 (112.48)*** | 81.25 (59.22)*** |
| Degree | 544.74 (103.67) | 75.34 (54.98) |
| Deprivation quintile | ||
| Least | 553.77 (102.27)*** | 78.54 (56.85)*** |
| 2 | 555.94 (109.68) | 78.69 (57.23) |
| 3 | 555.49 (109.33) | 79.72 (59.46) |
| 4 | 558.15 (109.76) | 78.54 (57.59) |
| Most | 558.80 (113.94) | 77.65 (56.12) |
| Alcohol intake | ||
| Non-drinkers | 574.79 (119.88)** | 83.99 (67.08)** |
| Monthly | 558.45 (112.07) | 78.18 (56.34) |
| Weekly | 553.84 (107.35) | 78.38 (56.98) |
| Body mass index | ||
| ≤Normal | 555.57 (109.10)*** | 78.72 (58.20)** |
| Overweight | 553.86 (108.11) | 77.45 (55.24) |
| Obese | 561.73 (111.56) | 81.26 (60.55) |
| Walking tertiles (days/week) | ||
| 0–4 | 550.89 (106.82)* | 76.87 (54.65)** |
| 5–6 | 555.28 (108.57) | 78.35 (56.83) |
| 7 | 559.50 (110.27) | 80.02 (59.64) |
| Smoking | ||
| Non-smokers | 552.91 (108.06)*** | 78.22 (57.40) |
| Previous smokers | 561.07 (110.88) | 79.48 (57.78) |
| Current smokers | 554.39 (107.61) | 77.65 (55.23) |
***P < 0.001, **P < 0.01, *P < 0.05.