 model (see Table [0](#T0){ref-type="table"}), the results showed that the total effect of PTS symptoms at T0 on PTS symptoms at T0 was significant (Coeff. = 0.00 *p* \< 0.000; *c path*). The effect of PTS symptoms at T0 on maternal sleep difficulties at T0 was also significant (Coeff. = 0.00; *p* \< 0.000; *a path*). The effect of the mediator on PTS symptoms at T0 was significant (Coeff. = 0.00; *p* \< 0.00; *b path*). The direct effect of PTS symptoms at T0 on the outcome (PTS symptoms at T0) was also significant (Coeff. = 0.00; *p* \< 0.000; *c*′ *path*). The indirect effect of PTS symptoms at T0 on those at T0, through the mediation of sleep difficulties, was significant (*r*^0^ = 0.00; *F* = 00.00; *p* \< 0.000; Coeff. = 0.00; 00% CI = \[0.00, 0.00\]) and the coefficient of the *R*-squared mediation effect size was 0.00 (00% CI = 0.00, 0.00). 