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Table 1 Baseline characteristics of study sample

From: Comparison of cognitive functioning as measured by the Ruff Figural Fluency Test and the CogState computerized battery within the LifeLines Cohort Study

  LifeLines sample adult populationa Total sample present study population Sample present study population in the correlation analyses
N (%)b N N (%)b N N (%)b N
Age (years), mean (SD) 45 (13.1) 152180 53 (14.6) 509 53 (14.5) 471
Gender (female) 89050 (59%) 152180 254 (50%) 509 232 (49%) 471
Education level   148679   507   469
  ≤ 12 years 45439 (31%)   120 (24%)   106 (23%)  
  > 12 years 103240 (69%)   378 (76%)   363 (77%)  
Nationality   151575   507   469
 Dutch 143040 (94%)   468 (92%)   433 (92%)  
 Other 8535 (6%)   39 (8%)   36 (8%)  
Ruff Figural Fluency Test (RFFT)c   -     
 Number of unique designs, mean (SD)    85.16 (24.37) 485 85.50 (24.18) 471
 Error ratio, median (IQR)    0.09 (0.05–0.15) 485 0.09 (0.05–0.15) 471
CogStatec   -     
 Groton Maze Learning (GMLT), median (IQR)    52 (41–64) 509 52 (41–64) 471
 Groton Maze Learning– Delayed Recall (GMLR), median (IQR)    7 (4–10) 504 7 (4–10) 471
 Detection (DET), mean (SD)    2.57 (0.17) 500 2.56 (0.17) 471
 Identification (IDN), mean (SD)    2.71 (0.09) 507 2.70 (0.08) 471
 One Back (OBK), mean (SD)    1.32 (0.22) 504 1.33 (0.20) 471
 One Card Learning (OCL), mean (SD)    0.97 (0.13) 506 0.98 (0.13) 471
Marital status (in a relationship)   150255   505   468
 Yes 128493 (86%)   403 (80%)   374 (80%)  
 No 21762 (14%)   102 (20%)   94 (20%)  
Smoking status   143245   500   462
 Never smoker 68672 (48%)   214 (43%)   201 (43%)  
 Past smoker 45350 (32%)   207 (41%)   189 (41%)  
 Current smoker 29223 (20%)   79 (16%)   72 (16%)  
Alcohol use   136437   483   451
 No alcohol use 29287 (21%)   70 (15%)   64 (14%)  
 Moderate alcohol use 86613 (64%)   343 (71%)   324 (72%)  
 Problematic alcohol use 20537 (15%)   70 (14%)   63 (14%)  
Physical activityd   138516   469   438
 Yes 67240 (49%)   250 (53%)   237 (54%)  
 No 71276 (51%)   219 (47%)   201 (46%)  
Number of neurological disorderse   150877   491   457
 No disease 147564 (98%)   476 (97%)   444 (97%)  
 1 disease 3228 (2%)   15 (3%)   13 (3%)  
 2 diseases 85 (0.1%)   0 (0%)   0 (0%)  
Number of cardiovascular disordersf   111463   404   375
 No disease 68921 (62%)   235 (58%)   218 (58%)  
 1 disease 33510 (30%)   125 (31%)   118 (32%)  
 2 diseases 8437 (8%)   40 (10%)   35 (9%)  
  ≥ 3 diseases 595 (1%)   4 (2%)   4 (1%)  
Depression (yes) 7538 (6%) 125987 33 (7%) 495 33 (7%) 460
Diabetes (yes) 3882 (3%) 151786 27 (5%) 507 25 (5%) 469
  1. aData available at the moment of data release of the present study; bThe percentage is reported, unless otherwise indicated; cIn the present study no data is available from the total LifeLines adult population; dComplies with the norm of at least thirty minutes of moderately intensive exercise at least 5 days a week; eStroke, multiple sclerosis, epilepsy; fMyocardial infarction, arrhythmia, heart failure, high blood pressure