Table 1.
Baseline Characteristics† of CCSMA Participants With and Without Complete Physical Activity Data
| Characteristic | Complete (N = 3,337) | Incomplete (N = 961) | χ 2 | t | p Value |
|---|---|---|---|---|---|
| Female, N (%) | 1,868 (55.98) | 548 (57.02) | 0.33 | .565 | |
| Physical activity, N (%) | N/A | ||||
| Sedentary | 37 (1.11) | — | |||
| Light | 267 (8.00) | — | |||
| Moderate–vigorous | 3,033 (90.89) | — | |||
| Presence of APOE e4, N (%) | 1,037 (31.08) | 273 (28.41) | 2.51 | .113 | |
| Subjective health status, N (%)* | 30.54 | <.001 | |||
| Excellent | 949 (28.44) | 197 (20.50) | |||
| Good | 1,906 (57.12) | 578 (60.15) | |||
| Fair | 427 (12.80) | 163 (16.96) | |||
| Poor | 55 (1.65) | 23 (2.39) | |||
| BDNF rs6265, N (%) | 0.04 | .979 | |||
| G/G | 2,108 (63.17) | 597 (62.12) | |||
| G/A | 973 (29.16) | 273 (28.41) | |||
| A/A | 139 (4.17) | 38 (3.95) | |||
| Missing | 117 (3.51) | 53 (5.52) | |||
| NGFR rs2072446, N (%) | 3.15 | .207 | |||
| C/C | 2,917 (87.41) | 828 (86.16) | |||
| C/T | 260 (7.79) | 68 (7.08) | |||
| T/T | 9 (0.27) | 6 (0.62) | |||
| Missing | 151 (4.53) | 59 (6.14) | |||
| NTRK2 rs2289656, N (%) | 2.02 | .364 | |||
| C/C | 2,154 (64.55) | 579 (60.25) | |||
| T/C | 922 (27.63) | 274 (28.51) | |||
| T/T | 112 (3.36) | 36 (3.75) | |||
| Missing | 149 (4.47) | 72 (7.49) | |||
| BDNF rs56164415, N (%) | 0.13 | .723 | |||
| C/C | 2,794 (83.73) | 800 (83.25) | |||
| T/C | 368 (11.03) | 101 (10.51) | |||
| Missing | 175 (5.24) | 60 (6.24) | |||
| BMI, N (%) | 1.83 | .609 | |||
| Underweight | 65 (1.95) | 25 (2.60) | |||
| Normal weight | 1,366 (40.93) | 390 (40.58) | |||
| Overweight | 1,314 (39.38) | 370 (38.50) | |||
| Obese | 592 (17.74) | 176 (18.31) | |||
| Depressive episode, N (%)* | 150 (4.50) | 71 (7.39) | 12.80 | <.001 | |
| Age, M (SD)* | 74.40 (6.56) | 76.38 (7.30) | −7.58 | <.001 | |
| Education, M (SD)* | 13.39 (2.84) | 12.99 (3.01) | 3.81 | <.001 | |
| 3MS, M (SD)* | 91.59 (6.00) | 88.86 (8.36) | 9.43 | <.001 | |
| MET-min, Median (min–max) | 4,894.63 (0–18,345.60) | — | N/A | ||
| Sedentary | 0 (0.00–0.00) | — | |||
| Light | 2,608.20 (7.69–13,910.40) | — | |||
| Moderate–vigorous | 5,304.60 (547.63–18,345.60) | — |
Notes: 3MS = Modified Mini-Mental State Exam; APOE = apolipoprotein E; BDNF = brain-derived neurotrophic factor; BMI = body mass index; CCSMA = Cache County Study on Memory in Aging.
†Baseline characteristics of participants with complete data for physical activity and covariates, compared to excluded participants with incomplete data. Significant differences were evaluated using Pearson’s chi-square tests of independence and t-test analyses for categorical and continuous variables, respectively.
*p < .05 in t test and Pearson’s chi-square tests of independence.