Protocol of a mixed method, randomized controlled study to assess the efficacy of a psychosocial intervention to reduce fatigue in patients with End-Stage Renal Disease (ESRD)

Table 1 Measures and instrumentation

	Instrumentation	T0	T1	T2	T3
Primary outcome measures
Fatigue severity	Checklist Individual Strength (CIS-fatigue) [43]	x	x	x	x
Secondary outcome measures
Quality of life	Kidney Disease and Quality of Life Short Form (KDQOL-SF) [48]	x	x	x	x
Mediating/moderating variables
Social support	Social Support Inventory (SSL-I + SSL-D) [58] + subscale Utrechtse Coping Lijst (UCL) [59]	x	x	x	x
Illness cognitions	Illness Cognition Questionnaire (ICQ) [60]	x	x	x	x
Illness perceptions	Illness Perception Questionnaire (IPQ-R) [61]: subscale emotional representation	x	x	x	x
Coping	Cognitive Emotion Regulation Questionnaire (CERQ) [62]	x	x	x	x
Catastrophizing thoughts	Fatigue Catastrophizing Scale (J-FCS) [63, 64]	x	x	x	x
Mastery	Mastery Scale [65]	x	x	x	x
Depression	Patient Health Questionnaire: Depression (PHQ-9) [66]	x	x
General effect modifiers
Demographic variables	Self-report: age, gender, education, ethnicity, social status, employment	x
Medical history and comorbidity	Self-report: treatment, treatment frequency, transplantability	x
Medical parameters	Medical records: sleep medication, Epo, Hb, Urea, Creatinine, Protein, Albumin, CRP, weight, height	x			x

ISSN: 1471-2369