Validity, test-retest reliability, and responsiveness of the Indonesian version of FACIT-COST measure for subjective financial toxicity

Table 6 Test-retest reliability and responsiveness of the FACIT-COST

Code	FACIT-COST item^a					Gwet’s AC2 for T1 and T2 follow-up groups combined (n = 187)
FT1	Have enough money to cover treatment					0.72
FT2	Out-of-pocket expenses are more than thought					0.71
FT3	Worry about future financial problems					0.71
FT4	No choice about money spent					0.71
FT5	Frustrated about inability to contribute/work as usual					0.76
FT6	Satisfied with current finances					0.69
FT7	Able to meet monthly expenses					0.64
FT8	Feel financially stressed					0.69
FT9	Concerned about keeping income					0.79
FT10	Reduced financial satisfaction due to treatment/disease					0.68
FT11	In control of finances					0.65
Patient subgroups		n	%	Mean (SD) FACIT-COST total score				ICC (95% CI)	SRM (95% CI)	SES (95% CI)
Patient subgroups		n	%	Baseline	Follow-up		Change	ICC (95% CI)	SRM (95% CI)	SES (95% CI)
*T1 and T2 combined*		298	100%	24.29 (8.66)	24.50 (8.68)		0.21 (4.96)
Improved in FT12		45	15%	19.47 (6.85)	24.60 (6.25)		5.13 (5.59)	-	0.92 (0.67, 1.18)	0.75 (0.51, 1.01)
Worsened in FT12		66	22%	24.17 (6.54)	21.62 (6.64)		-2.55 (5.13)	-	-0.50 (-0.77, -0.22)	-0.39 (-0.59, -0.19)
Unchanged in FT12		187	63%	25.49 (9.31)	25.49 (9.57)		0.00 (3.75)	0.96 (0.95, 0.97)	-	-

1. T1 follow-up = completed during the subsequent treatment cycle, T2 follow-up = completed during the post-treatment consultation
2. Gwet’s AC2 was computed for patients with unchanged FT12 response at the follow-up compared to the baseline
3. Test-retest reliability (Gwet’s AC2) for item FT12 was not computed because it was used as an anchor
4. Improved in FT12 = baseline item score greater than follow-up, worsened = follow-up item score greater than baseline, unchanged = baseline item score equaled to follow-up
CI Confidence interval, FACIT-COST COST: A FACIT Measure of Financial Toxicity, FT12 twelfth item of the FACIT-COST (‘financial hardship to my family and me’), ICC Intraclass correlation coefficient, SD Standard deviation, SEM Standard error of measurement, SES Standardized effect size, SRM Standardized response mean
^aLabeled by the authors based on the FACIT-COST items

ISSN: 1477-7525