Vienna Test System (VTS) - Vigilance/Sustained Attention (WAFV). A computerized test measuring sustained attention and vigilance. Participants monitor a continuous sequence of simple visual stimuli (e.g., small changes in geometric figures) presented at regular intervals. They are instructed to respond via button press whenever a predefined critical stimulus appears.

Scoring: main outcomes include number of correct detections (hits), omissions (missed targets), false alarms (incorrect responses), and reaction times. Higher hits and faster, stable reaction times indicate better vigilance; higher omissions or false alarms indicate poorer sustained attention.

Administration: conducted individually in a distraction-free environment using the standardized VTS software and response panel. Trained staff provide instructions and supervise.

25-Foot Walk Test (25-FWT). A quantitative measure of ambulatory function and walking speed. Participants are instructed to walk 25 feet (7.62 m) as quickly and safely as possible. Two trials are performed, typically with a short rest interval, and the average time (in seconds) is recorded using a stopwatch. Lower times = better mobility. Use of customary assistive devices (e.g., cane, walker) is permitted and documented.

Administration: conducted in a straight, unobstructed corridor with clearly marked start and finish lines. Trained staff provide standardized instructions and supervise for safety. Completion typically requires ~5 minutes.

Outcomes: average time to walk 25 feet (7.62 meters), ability to complete the test, and change from baseline.

Symbol Digit Modalities Test (SDMT). A brief neurocognitive test of attention, processing speed, and visual scanning. Participants are shown a key pairing nine symbols with digits 1-9. Using this key, they write or orally state the digit corresponding to each symbol in a randomized sequence presented on the test form.

Scoring: the number of correct substitutions completed in 90 seconds is counted. Higher scores = better cognitive performance. Errors are recorded but not included in the raw score. Written and oral versions are available; the same mode is used across visits for consistency.

Administration: conducted in a quiet environment with standardized instructions, requiring ~5 minutes. Staff monitor to ensure task adherence.

Outcomes: total correct substitutions and standard deviation change from the normal value.

Nine-Hole Peg Test (9-HPT). A standardized test of finger dexterity and fine motor function. Participants are instructed to place nine pegs into nine holes on a board, one at a time, as quickly as possible, and then remove them. Each hand is tested separately, typically with the dominant hand first, followed by the non-dominant hand.

Scoring: performance time (in seconds) for each hand is recorded with a stopwatch. Lower times = better dexterity. Two consecutive trials per hand are averaged. If a peg is dropped, the participant retrieves it and continues.

Administration: administered in a quiet environment by trained staff using standardized instructions. Completion time is usually 3-5 minutes for both hands.

Outcomes: mean completion time for each hand and change from baseline.

A neuropsychological assessment of visual memory, perception, and visuoconstructive ability. Participants are shown a series of 10 geometric designs, each displayed for 10 seconds, and then asked to reproduce the design from memory using paper and pencil (Administration A). Alternate forms may be used to minimize practice effects.

Scoring: each reproduction is scored for number correct (maximum = 10) and for errors (e.g., omissions, distortions, rotations, perseverations, misplacements). Higher correct scores indicate better performance, while higher error counts indicate impairment.

Administration: conducted individually in a quiet setting by trained staff; typical completion ~15 minutes.

Outcomes: total correct responses, total errors, and change from baseline.

Big Five Inventory-2 Short Form (BFI-2-S). A 30-item self-report assessing five personality domains: Extraversion, Agreeableness, Conscientiousness, Negative Emotionality, and Open-Mindedness. Items are rated on a 5-point Likert scale (1 = disagree strongly to 5 = agree strongly). For each domain, compute the mean of its 6 items after applying the manual's reverse-keying rules; higher scores = more of that trait. No total score is used.

Administration: validated language version via paper or secure ePRO; typical completion ~5-7 min. Staff provide standardized instructions and check completeness.

Outcomes: domain scores (1-5) and change from baseline. Timing: baseline and follow-ups within ±3 days of the visit window.

An 8-item self-report of daytime sleepiness. Participants rate their chance of dozing in common situations from 0 (would never doze) to 3 (high chance). Total score = sum of items (range 0-24; higher = worse sleepiness). Severity bands: 0-5 normal, 6-10 higher-than-normal, 11-12 mild, 13-15 moderate, 16-24 severe.

Administration: validated language version via paper or secure ePRO; typical completion ~2-3 min. Staff provide standardized instructions and check completeness before scoring.

Outcomes: total score; change from baseline; response = ≥3-point reduction from baseline; remission = score ≤10.

A 21-item self-report questionnaire assessing depressive symptoms over the past 2 weeks, including today. Each item is rated 0-3; total score ranges 0-63, with higher scores indicating more severe depression. Severity categories: 0-13 minimal, 14-19 mild, 20-28 moderate, 29-63 severe. The BDI-II is administered in validated language versions on paper or secure ePRO, requiring ~5-10 minutes. Staff provide standardized instructions and check completeness. Outcomes include total score, change from baseline, response (≥50% reduction from baseline), and remission (score ≤13).

This self-report questionnaire captures recent driving exposure and perceived difficulties over the past month. Items use 7-point Likert scales anchored "Never (1)" to "Every drive (7)". Content includes deliberate avoidance of challenging conditions (night driving, heavy traffic, bad weather, highways, unfamiliar routes), fatigue while driving, uncertainty in traffic situations (e.g., speed limits, lane selection, right of way), perceived complexity/overload, inattention, vehicle-control errors (e.g., wrong gear, pedal mix-ups), oversight errors (e.g., missed lights/signs, failure to check mirrors), warnings from other road users, risk-taking, traffic-rule violations, and emotional arousal during driving. A brief exposure module records typical driving frequency, lifetime kilometers, and the frequency of driving in specific conditions. Higher scores indicate more frequent difficulties; the primary metric is the mean item score (1-7).