Table 2.

Summarises the factors associated with CB.

	Abed et al.	Adejumo et al.	Affinito et al.	Alnazly	Alvarez et al.	Al Wakeel & Bayoumi	Avsar et al.	Avsar et al.	Bardak et al.	Bayoumi	Belasco & Sesso	Belasco et al.	Cagan et al.	Cantekin et al.	Faridah et al.	Harris et al.	Hoang et al.	Jafari et al.	Joy et al.	Kang et al.	Kilic & Kaptanogullari	Mashayekhi et al.	Mollaoğlu et al.	Nagarathnam et al.	Oyegbile	Paschou et al.	Rafati et al.	Rioux et al.	Rodrigue et al.	Senmar et al.	Shah et al.	Shakya et al.	Shimoyama et al.	Tao et al.	Washio et al.	Wicks et al.	Zhang et al.	Zhang et al.
Caregiver Age	s			n		s	n		n	s	n		n	n	s	n	s	s	n		n	n	s			n	s		n	s		s					s	n
Patients Age	n			n	s				n	s	n	s						n				n					n			s			s					n
Caregiver gender	n	s		n			n		n		s	n	s	n	n			n	s		n	n	s		n	n			n	n				s		n		s
Patient gender	n			n					n		s	n						n				s					n			n				n		n		n
Caregiver education	n			n		s	n		n	s	n		n	n	n			s			n	n	s		n	n	s			n		s		n			s	n
Patient education	n			n					n	s	s											n					s							n
Caregiver occupation	n								n		n		s				n	n				n	n		n	n	s									n	s
Patient occupation	n								n		n											n					s
Marital status of caregiver	n								n				n				s	n			n	s	s		n	n	n			n		s
Marital status of patient	n								n													n					n			n
caregiver income	n						n				n		s	n	s		n	n				s	n				n							s				n
Patient income	n										n																s			n							s
Socio-economic class caregiver											s																				s	s
Caregiver ethnicity and race																									n											n
Caregiver Religion/ spirituality																									n		s
Caregiving hours/day, week				n	s						n				n		s		s						n						s			n			s	s
Length of caregiving (months, years)	n			n			n				s		s	n			s		s	s															s
Duration of patient illness						n				n
Duration of dialysis	n								s		n		s					n				n					n			n	s	n						s
Caregiver relationship to patient	n			n					n		s		n				n				s	n	s		n		n			s		s		n	s	n	s	n
Duration of relationship
Cohabiting status				s					n		n		n												n									n				s
Place of residence (town, village) (rural–urban)													n								s		s
Patient functional dependency level					s													s				n					s		s		s			s				s
Caregiver poor physical and mental health			s																																	s
Patient comorbidity history	n				s						s							s				n										n					s	s
Caregiver comorbidity history	s				s						n		n				s						s												s
Smoking and alcohol consumptions													n
Number of medication of patients					s
Number of caregiver children													s
Number (frequency) of dialysis session													n									n					s					n
Social support				s	s																											s		s
Coping ability to caregiving role				s															s
Positive role caregiver			s
HRQol of caregiver/QoL		n																s											s				s			s		s
Carer Depression and anxiety		s							s																	s		s				s			s
Patient Depression and anxiety																																		s
Dialysis modalities (HD, PD)					n	n			s			n		s																						n
Dialysis dependent or not																										n			s
Before and after RT							s	s	s															s			s		n
Caregiver health literacy	s																s
Caregiver performing exercise																																						s

HRQoL = health-related quality of life, HD = haemodialysis, PD = peritoneal dialysis, RT = renal transplant, n = factor explored but did not show a significant association to CB, s = factor explored and showed a significant association to CB.