Table 1.
Description of health variables across each of four domains (cognitive, neural, physical, mental)
| Health domain | Task and description | Variable | Descriptives | References |
| Cognitive | Story Recall Immediate: participants hear a short story and are asked to recall as accurately as possible. |
Recall manually scored for similarity and precision (min=0, max=24) | n=2379, M=13.14, SD=4.66, range=0–24 | 92 |
| Cognitive | Story Recall Delayed: same as above but recall after 30 min delay |
Recall manually scored for similarity and precision (min=0, max=24) | n=2366, M=11.47, SD=4.92, range=0–24 | 92 |
| Cognitive | Letter Fluency (phonemic fluency): participants have 1 min to generate as many words as possible beginning with the letter ‘p’. |
Total words generated (min=0,max=30) | n=2360, M=25.38, SD=3.96, range=0–30 | 92 |
| Cognitive | Animal Fluency (semantic fluency): participants have 1 min to generate as many words as possible in the category ‘animals’. |
Total words generated (min=0,max=30) | n=2346, M=25.85, SD=4.47, range=0–30 | 92 |
| Cognitive | Cattell Culture Fair: test of fluid reasoning using four subtests (series completions, odd one out, matrices and topology) |
Total correct summed across four subtests (min=0, max=46) | n=658, M=31.8, SD=6.79, range=11–44 | 93 |
| Cognitive | Simple reaction time: speed in a simple reaction time task |
1/response time in seconds | n=657, M=0.37, SD=0.08, range=0.24–0.93 | 12 |
| Cognitive | Addenbrooke's Cognitive Examination, Revised: screening test for dementia using seven subtests (orientation, attention and concentration, memory, fluency, language, visuospatial abilities, perceptual abilities) |
Performance on multiple tests converted to min=0, max=100 range | n=2406, M=89.25, SD=13.4, range=0–100 | 24 |
| Neural | White matter health: measure of tract integrity using fractional anisotropy |
Fractional anisotropy (min=0, max=1, averaged across 10 tracts) | n=641, M=0.5, SD=0.03, range=0.3–0.56 | 73 |
| Physical | Self-reported health, in general: participants use a four-point scale to respond to the prompt “Would you say for someone of your age, your own health in general is…” |
Score from 1=excellent to 4=poor | n=2404, M=2.02, SD=0.79, range=1–31–3 | 93 |
| Physical | Self-reported health, last 12 months: participants use a three-point scale to respond to the prompt “Over the last twelve months would you say your health has on the whole been…” |
Score from 1=good to 3=poor | n=2398, M=1.46, SD=0.71, range=1–31–3 | 93 |
| Physical | Systolic blood pressure | Mean systolic blood pressure in mm Hg, averaged across three consecutive measurements | n=577, M=120.11, SD=17, range=78.5–186 | |
| Physical | Diastolic blood pressure | Mean diastolic blood pressure in mm Hg, averaged across three consecutive measurements | n=577, M=73.14, SD=10.48, range=49–115.5 | |
| Physical | Resting pulse | Mean pulse in beats per minute, averaged across three consecutive measurements | n=578, M=65.69, SD=10.5, range=40–110.5 | |
| Physical | Body Mass Index (BMI) | (weight in kg)/(height in m2) | n=584, M=25.77, SD=4.59, range=16.75–48.32 | 94 |
| Mental health | Anxiety Subscale (Hospital Anxiety and Depression Scale (HADS)): participant's response to seven questions about anxiety-related behaviours |
Seven questions rated on 0–3 scale (‘often’ to ‘very seldom’) (min=0, max=21) | n=2391, M=5.13, SD=3.31, range=0–17 | 56 |
| Mental health | Depression Subscale (HADS): participant's response to seven questions about depression-related behaviours | Seven questions rated on 0–3 scale (‘often’ to ‘very seldom’) (min=0, max=21) | n=2373, M=3.32, SD=2.91, range=0–14 |
For each variable, details are given including a description of the task it is derived from, relevant citations, a brief definition and descriptive statistics.