Table 5.

Baseline Fractional Shortening Z Scores and Changes in Z Score in Children With Dilated Cardiomyopathy by Percentile and by Outcome

FS Percentile	FS‐z	Death/Transplant		Survived		Sensitivity %	Specificity %
		Baseline <FS‐Z (true +)	Baseline ≥FS‐Z (false −)	Baseline ≥FS‐Z (true −)	Baseline <FS‐Z (false +)
Outcome at 1 y
(n=137)				(n=518)
25th	−10.94	44	93	402	116	32.1	77.6
50th	−9.04	83	54	277	241	60.6	53.5
75th	−5.94	119	18	153	365	86.9	29.5
Outcome at 7 y
(n=241)				(n=112)
25th	−10.94	67	174	82	30	27.8	73.2
50th	−9.04	132	109	53	59	54.8	47.3
75th	−5.94	200	41	29	83	83.0	25.9

Change in FS percentile	Change in FS Z score	Change<FS‐Z (true +)	Change ≥ FS‐Z (false −)	Change ≥ FS‐Z (true −)	Change<FS‐Z (false +)	Sensitivity %	Specificity %
Outcome at 1 y
(n=117)				(n=479)
25th	−0.18	50	67	380	99	42.7	79.3
50th	1.95	95	22	267	212	81.2	55.7
75th	5.50	111	6	134	345	94.9	28.0
Outcome at 7 y
(n=210)				(n=105)
25th	−0.18	85	125	85	20	40.5	81.0
50th	1.95	160	50	64	41	76.2	61.0
75th	5.50	197	13	33	72	93.8	31.4

Sensitivity and specificity of baseline echocardiographic LV fractional shortening Z score and change in baseline LV fractional shortening Zscore at follow‐up assessment for the prediction of death or cardiac transplant vs survival at 1 year and at 7 years in children with dilated cardiomyopathy for whom echocardiographic values were available. Values at the 25th, 50th, and 75th percentile of the range are shown. FS indicates fractional shortening; and LV, left ventricular.