Table II.

Regression statistics for ζ potential compared with ψ₀

r² for ζ potential = a + bψ₀, where ψ₀ was computed by two models: ψ_0,Y was computed according to the model presented by Yermiyahu et al. (1997c), and ψ_0,A was computed according to the adjusted model of the present study. Each study is numbered according to its appearance in Table I.

Study No.	ζ Potential
	a + bψ0,Y			a + bψ0,A
	r2	a	b	r2	a	b
1	0.911	3.7a	0.761	0.929	0.0a	0.723
2	0.923	0.6a	0.252	0.929	0.6a	0.254
3	0.997	−1.9a	0.343	0.997	−1.9a	0.343
4	0.927	−4.9a	0.468	0.935	−5.2a	0.468
5	0.866	0.0a	0.274	0.945	−5.4	0.196
6	0.963	15.7	0.481	0.997	4.8	0.318

^aNot statistically different from 0.