Table 7.

Process capability of quality characteristics in blue catfish sperm high-throughput cryopreservation. Pp: long-term capability of process; Process Z: Z-value using standard normal distribution for average defect rate; Cp: short-term process capability.

Quality characteristic	Year*	Data distribution	Index	Value
Post-thaw motility		Smallest extreme value	Pp	1.18
Post-thaw membrane integrity	2010	Weibull	Pp	0.60
	2011	Weibull	Pp	0.53
Post-thaw concentration	2010	Weibull	Pp	0.13
	2011	Logistic	Pp	0.08
Sex**	2011	Binomial	Process Z	1.64
Size		Binomial	Process Z	2.10
Color		Binomial	Process Z	1.24
Anterior testis size		Binomial	Process Z	1.40
Initial concentration	2010	Weibull	Pp	0.16
	2011	Normal	Cp	0.71
Initial motility	2010	Smallest extreme value	Pp	0.76
	2011	Weibull	Pp	1.01
Equilibration motility		Weibull	Pp	1.46

^*When 2010 and 2011 data were statistically different, quality control was performed separately.

^**2010 data showed no defects, therefore, quality control was only performed on 2011 data.