Table 4.

Correlation matrix showing the relationship between nuclear opalescence and different parameters

			CDE	Torsional T.	Average Phaco Power	Average Phaco Power/3	Volume	Aspiration T.	Phaco T.	ECLoss%
Kendall’s tau_b	Nuclear opalescence	Correlation coefficient	0.52	0.41	0.20	0.26	0.45	0.28	0.36	0.42
		Sig. (2-tailed)	0.000	0.000	0.003	0.000	0.00	0.000	0.000	0.000
		Number	120	120	120	120	120	120	120	120

Notes: Kendall’s rank-correlation coefficient, tau, (τ) was used to evaluate the relationship between ordinal (nuclear opalescence grade) and continuous variables.

Abbreviations: ECLoss%, percentage of endothelial cell loss; US Tot. Eq. P/3, ultrasonic total equivalent power in position 3; Avg_Phaco_Power/3, Average phaco power in position 3; Eq. Avg. Tor. Ampl/3, equivalent average torsional amplitude in position 3; CDE, cumulative dissipated energy. Torsional T, torsional time, Aspiratio T, Aspiration time; Phaco T, phaco time.