Table 3.

Performance indicator categories.

Performance indicator	Performance categories
	Low	Medium	High
K0	0	1	≥2
K1	≤5	6–7	≥8
K2	≤1	2–3	≥4
K3A	≤1	2	≥3
K3B	0	1	≥2
⅀(K2 + K3A + K3B)	≤3	4–6	≥7
PC serve	≤1.40	1.41–1.80	≥1.85
PC server reception	≤2.21	2.23–2.70	≥2.75
PC set	≤2.26	2.31–2.76	≥2.77
PC attack	≤2.56	2.63–3.25	≥3.27
PC block	≤1.33	1.40–2.22	≥2.40
PC dig	≤1.63	1.66–2.42	≥2.66
PC set (CA)	≤2.30	2.33–2.77	≥2.80
PC attack (CA)	≤2.40	2.42–3.30	≥3.40
EFF attack	≤18.18	18.75–46.15	≥46.66
EFF counterattack	≤0.00	10.00–44.40	≥45.50

PC, performance coefficient; EFF, efficiency; CA, counterattack.

Categorized by distance measure: log-likelihood; clustering criterion: Bayesian information criterion method.