Table 3.

Predictors of HAMD scores by personality cluster plus interactions over time

Parameters	Estimate	SE	df	t-value	P-value	95% confidence interval
						Lower bound	Upper bound
Intercept	2.841	0.225	86.779	12.624	0.000	2.394	3.289
Cluster A	0.431	0.360	76.968	1.197	0.235	−0.286	1.148
Cluster B	0.793	0.304	81.440	2.606	0.011	0.188	1.399
Cluster C	0.074	0.333	78.972	0.221	0.826	−0.590	0.737
Mixed cluster	0.673	0.284	81.562	2.368	0.020	0.108	1.238
No PD	0a	0.000	–	–	–	–	–
Time	−0.496	0.104	52.941	−4.786	0.000	−0.704	−0.288
Time square	0.359	0.075	118.338	4.809	0.000	0.211	0.507
Cluster A * time	0.003	0.152	49.556	0.020	0.984	−0.302	0.308
Cluster B * time	0.074	0.138	53.178	0.533	0.596	−0.203	0.351
Cluster C * time	−0.061	0.152	55.562	−0.401	0.690	−0.366	0.244
Mixed cluster * time	0.029	0.128	52.577	0.224	0.824	−0.229	0.286
No PD * time	0a	0.000	–	–	–	–	–
Cluster A * time square	−0.057	0.112	110.740	−0.507	0.613	−0.278	0.165
Cluster B * time square	−0.142	0.100	111.332	−1.423	0.158	−0.340	0.056
Cluster C * time square	−0.091	0.107	109.324	−0.852	0.396	−0.303	0.121
Mixed cluster * time square	−0.198	0.091	112.446	−2.165	0.033	−0.379	−0.017
No PD * time square	0a	0.000	–	–	–	–	–

Notes:

^aThis parameter is set to zero because it is redundant. Interaction between two variables is denoted by the symbol*.

Abbreviations: SE, standard error; df, degrees of freedom; PD, personality disorder; HAMD, Hamilton Rating Scale for Depression-17.