Skip to main content
. 2022 May 9;4(3):fcac119. doi: 10.1093/braincomms/fcac119

Table 1.

Imaged versus non-imaged baseline values: demographic, lifestyle, psychological and physical health variables

95% CI for mean difference
t df P-value Mean difference Lower Upper Cohen's d
Age (years) −38.724 502 488 <0.001 −1.503 −1.579 −1.427 −0.186
Sex (male N*) 132.469 1 <0.001 −0.111 −0.129 −0.092 0.016
Degree yes, N* 4365.962 1 <0.001 −0.635 −0.654 −0.616 0.094
White British, N* 416.475 1 <0.001 −0.342 −0.375 −0.309 0.029
Townsend score −43.035 501 865 <0.001 −0.639 −0.668 −0.610 −0.207
Diabetes, N* 668.37 1 <0.001 0.724 0.668 0.781 −0.037
High blood pressure, N* 1214.326 1 <0.001 0.41 0.387 0.433 −0.049
Coronary heart disease, N* 567.799 1 <0.001 0.714 0.654 0.774 −0.034
Neurological condition, N* 328.033 1 <0.001 0.509 0.454 0.565 −0.026
Inflammatory condition, N* 631.573 1 <0.001 0.356 0.328 0.384 −0.036
Medication use, N* 740.545 1 <0.001 0.39 0.362 0.418 −0.038
Smoking status (ever smoker), N* 672.739 1 <0.001 0.254 0.235 0.273 −0.037
Alcohol frequency (≥weekly), N* 970.125 1 <0.001 −0.36 −0.383 −0.338 0.045
Diastolic blood pressure (mmHg) −14.125 461 276 <0.001 −0.729 −0.830 −0.628 −0.071
Systolic blood pressure (mmHg) −27.554 461 272 <0.001 −2.581 −2.764 −2.397 −0.138
Body mass index −38.317 499 384 <0.001 −0.883 −0.929 −0.838 −0.184
Good/excellent health, N* 1803.851 1 <0.001 −0.572 −0.599 −0.546 0.062
Poor health, N* 242.253 1 <0.001 0.571 0.498 0.644 −0.043
Verbal-numerical reasoning score 43.867 165 452 <0.001 0.782 0.747 0.817 0.364
Log reaction time −40.482 496 663 <0.001 −0.037 −0.039 −0.035 −0.195
Reaction time (ms) −39.888 496 663 <0.001 −22.612 −23.724 −21.501 −0.192
Log visual memory errors −15.956 497 865 <0.001 −0.051 −0.057 −0.045 −0.077
Visual memory errors −20.894 497 865 <0.001 −0.343 −0.375 −0.311 −0.101
Prospective memory, successful on first attempt, N* 432.074 1 <0.001 −1.13 −1.243 −1.018 0.056
Unhappy, N* 18.859 1 <0.001 0.18 0.099 0.262 −0.01
Neuroticism score −19.933 401 561 <0.001 −0.342 −0.375 −0.308 −0.105
Self-reported depression, N* 78.898 1 <0.001 0.199 0.155 0.243 −0.013

Student’s t-test for continuous variables. For dichotomous variables denoted by N*: t = chi-square x2, mean difference = log odds ratio (difference), Cohen’s d = Cramer’s V. Mean difference reflects imaged group (i.e. imaged average—non-imaged average).