Table 2.

Growth model parameter estimates

Measure	Fixed-Effects Parameter Estimates								P Value for Model Fit (Wald)
	Change over Time	Dialysis Initiation	Age	Comorbidity	KPS Score	Sex	Propensity Score	Constant
SF-36
Mental health	0.12±0.32a	−0.69±5.8	0.21b	−3.09a	−0.43	0.68	2.68	50.7b±6.2	<0.001
Physical health	0.04±0.17	0.49±1.7	−0.16b	1.61	−1.21b	−0.35	−4.04	21.1b±4.4	<0.001
SWLS	0.02±0.11	−1.84a±4.5	0.12b	−2.70a	−0.35	0.71	−0.14	23.5b±5.5	<0.001
HADS
Depression	−0.03±0.10	−0.57±1.7	−0.10b	1.17	0.29b	−0.81	0.02	5.56b±3.1	<0.001
Anxiety	−0.004±0.14	−0.02±2.6	−0.02	0.73	0.53b	0.10	−0.78	5.36b±2.5	<0.001

Unless otherwise noted, values are expressed as mean ± SD. Change over time (growth) for the fixed effect is the estimated change per month in the quality-of-life measure. Similar interpretations can be applied to dialysis initiation and the constant. Age, comorbidity, KPS score, sex, and propensity score were entered into the model as fixed effects only to adjust for variation between groups at baseline. SDs for age, comorbidity, KPS score, sex, and propensity score were not estimated because of constraints on model fitting. KPS, Karnofsky performance scale; SF-36, quality-of-life assessment using Short-Form 36 questionnaire; HADS, Hospital Anxiety and Depression Scale; SWLS, Satisfaction with Life Scale.

^aP<0.05.

^bP<0.01.