Table 4.

Certainty assessment (Scales)

Nº of studies	Study design	Risk of bias	Inconsistency	Indirectness	Imprecision	Other considerations	Effect	Certainty
ONI: [43] Vecchio
1	observational studies	seriousa,b	not serious	not serious	seriousc	none	ONI survey predict nursing and allied health resource requirements for home care services	⨁⨁◯◯ Low
CHIRS: [31] Hays BJ, [36] Peters
2	observational studies	seriousa,b	not serious	not serious	seriousc	none	Workload increased with each increasing level of CHIRS rating CHIRS explains variations on resource consumption	⨁⨁◯◯ Low
Health Status Scale: [41] Ballard
1	observational studies	seriousd,e	not serious	seriousf	serious	all plausible residual confounding would reduce the demonstrated effect	The higher the Health Status Scale score, the greater the use of resources	⨁⨁◯◯ Low
VNA-LA/USC HHPCS: [33] Churness
1	observational studies	very seriousa,g	not serious	not serious	seriousc	all plausible residual confounding would reduce the demonstrated effect	The is a relationship between total score and workload	⨁⨁◯◯ Low

^a Convience sample

^b Single centre study

^c Precision of results not reported

^d Validity data of the measuring instrument not shown

^e Lack of sample size estimation

^f Very specific population. Generalization problems

^g Posible information bias