Table 1.

Examples of indices calculated from the zeroth persistence diagram PD₀.

	Grade	Mean	95% CI
PHI	G1	0.324	0.292–0.356
	G2	0.435	0.362–0.508
	G3	0.616	0.570–0.662
RSS	G1	0.663	0.642–0.683
	G2	0.684	0.663–0.704
	G3	0.629	0.580–0.678
WSS1	G1	42.00	39.84–44.17
	G2	42.97	39.00–46.94
	G3	41.57	37.91–45.23
WSS2	G1	26.57	25.23–27.90
	G2	29.00	26.57–31.42
	G3	33.96	31.61–36.32
${\mathrm{Center}}_{x1}$	G1	52.13	47.83–56.42
	G2	43.76	39.15–48.37
	G3	34.49	31.56–37.42
${\mathrm{Center}}_{y1}$	G1	175.1	169.0–181.3
	G2	170.7	155.3–186.0
	G3	137.4	121.1–153.6
${\mathrm{Center}}_{x2}$	G1	147.3	142.6–152.0
	G2	146.3	137.0–155.6
	G3	129.6	110.7–148.5
${\mathrm{Center}}_{y2}$	G1	206.6	203.8–209.5
	G2	205.9	199.8–212.0
	G3	193.9	182.4–205.4