Table 4.

Partial correlations between change in mindfulness (CAMS-R) and change in sleep quality (PSQI).

Controlled transdiagnostic variable	Partial correlation	Partial correlation with covariates
Change in rumination
r	−0.158	−0.144
p value	0.032	0.055
df	183	176
Change in intrusive thoughts
r	−0.149	−0.142
p value	0.043	0.059
df	183	176
Change in thought suppression
r	−0.155	−0.140
p value	0.035	0.063
df	183	176
Change in avoidance
r	−0.144	−0.286
p value	0.282	0.042
df	56	49
Change in cognitive reappraisal
r	−0.178	−0.161
p value	0.015	0.032
df	184	176
Change in expressive suppression
r	−0.151	−0.129
p value	0.039	0.085
df	184	176

Note. Bivariate correlation between change in mindfulness and change in sleep quality was r = −0.211, df = 186, p = 0.004. All partial correlations were lower, indicating that each transdiagnostic variable uniquely accounted for part of the original association between increased mindfulness and increased sleep quality. After accounting for changes in transdiagnostic variables, the correlation between change in mindfulness and change in stress-related symptoms remained statistically significant, except for change in avoidance, which was measured in fewer cases. Further controlling for covariates did not substantively change the magnitude of partial correlations nor the p values; however, four p values become marginally significant, and one (for change in avoidance) dropped markedly.