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Table 5 Hayes Process Mediation Model 4 for 10,000 bootstrapped samples: Regression and mediation coefficients

From: Prospective observational cohort study of ‘treatment as usual’ over four years for patients with schizophrenia in a national forensic hospital

  Change in Y C1: direct effect of X on Y before mediation C2: direct effect of X on Y after mediation A: indirect effect of X on Y mediated via M B: direct effect of M on Y adjusted for X
R 2 p Unstandardized effect size 95% CI Unstandardized effect size 95% CI Unstandardized effect size 95% CI Unstandardized effect size 95% CI
Total sample n = 69
 Model A
  X = MCCB 0.6241 0.0000 −0.0065 −0.0345, 0.0215 0.0307 − 0.0057, 0.0671 0.0372 0.0129, 0.0663 1.8406 1.3673, 2.3138
  M = change D-3 mean
 Model B
  X = MCCB 0.6044 0.0000 0.0121 0.0019, 0.0223 0.0202 0.0064, 0.0340 0.0081 −0.0020, 0.0168 0.2637 0.1959, 0.3316
  M = change HCR-C
Less than 5 years n = 35
 Model A
  X = MCCB 0.6748 0.0000 −0.0338 −0.0758, 0.0081 0.0213 −0.0312, 0.0738 0.0551 0.0239, 0.0911 1.8597 1.1937, 2.5257
  M = change D-3 mean
 Model B
  X = MCCB 0.6768 0.0000 0.0237 0.0092, 0.0382 0.0296 0.0093, 0.0500 0.0059 −0.0075, 0.0199 0.2797 0.1795, 0.3799
  M = change HCR-C
More than 5 years n = 34
 Model A
  X = MCCB 0.6503 0.0000 0.0240 −0.0146, 0.0626 0.0419 −0.0144, 0.0981 0.0179 −0.0211, 0.0744 2.099 1.3878, 2.8104
  M = change D-3 mean
 Model B
  X = MCCB 0.6315 0.0000 −0.0026 −0.0167, 0.0015 0.0085 −0.0115, 0.0285 0.0111 −0.0018, 0.0260 0.2653 0.1754, 0.3551
  M = change HCR-C
  1. Note: CI Confidence interval, MCCB MATRICS consensus cognitive battery, D-3 DUNDRUM-3 Programme Completion Scale mean total score, HCR-C History-Clinical-Risk Management-20 clinical items. In Model A the outcome variable (Y) was change in HCR-20 clinical items during the study. In Model B the outcome variable (Y) was change in DUNDRUM-3 Programme Completion Scale mean total score during the study. X, independent variable; M, mediator variable. All models were controlled for HCR-20 clinical baseline scores and DUNDRUM-3 mean total score at baseline
  2. Model A: Y = HCR-20 clinical score change over four years. Model B: Y = DUNDRUM-3 mean total score change over four years; Results in bold are statistically significant