Table III.

Regression Coefficients From Linear Mixed Models for Maternal Psychological Distress Z-Scores

	Estimate (SE)	95% CI	p-Value
Model with main effects only
Main effect of group	0.34 (0.16)	0.03 to 0.66	.03
Main effect of time	0.01 (0.01)	−0.01 to 0.03	.47
Social risk	0.32 (0.16)	0.02 to 0.62	.04
Model including a group × time interaction
Effect of time in VPT group	0.02 (0.01)	−0.004 to 0.04	.12
Effect of time in full-term group	−0.01 (0.01)	−0.04 to 0.01	.32
Group × time interaction effect	0.02 (0.02)	−0.02 to 0.06	.41

Note. CI = confidence interval; SE = standard error; VPT = very preterm.