Table 1.
Variable | pull/frozen/Sarstedt 0.5 mL screw top | pull/frozen/Fisher 1.5 mL microcentrifuge | pull/frozen/Fisher 2.0 mL cryovial | pull/frozen/Matrix 1.0 mL cryotube | drip/fresh/Sarstedt 2.5 mL non-stick | drip/frozen/Sarstedt 2.5 mL non-stick |
---|---|---|---|---|---|---|
Number of participants | 249 | 393 | 36 | 201 | 43 | 95 |
Number of observations | 252 | 501 | 36 | 223 | 43 | 95 |
Number of measurements | 290 | 543 | 60 | 225 | 43 | 95 |
Diagnosis, unimpaired, n (%) | 222 (89%) | 322 (82%) | 32 (89%) | 168 (84%) | 37 (86%) | 82 (86%) |
Diagnosis, MCI, n (%) | 17 (7%) | 37 (9%) | 4 (11%) | 18 (9%) | 3 (7%) | 7 (7%) |
Diagnosis, dementia, n (%) | 3 (1%) | 27 (7%) | — | 10 (5%) | — | — |
Diagnosis, missing, n (%) | 7 (3%) | 7 (2%) | — | 5 (2%) | 3 (7%) | 6 (6%) |
Age at lumbar puncture, mean (SD) | 65.33 (7.58) | 64.86 (8.58) | 63.65 (8.98) | 64.20 (8.48) | 67.97 (7.29) | 65.33 (8.30) |
Number of cognitive visits, mean (SD) | 4.95 (2.27) | 5.59 (2.14) | 5.53 (1.92) | 5.28 (2.71) | 5.47 (2.33) | 4.79 (2.66) |