Chitosan@TiO2 composites for the adsorption of copper(II) and antibacterial applications

Table 3 Regression analysis of the effect of the inhibition zone on other variables

Test species	E. coli (N = 83)				S. epidermidis (N = 90)
Variable	B	95% CI		p-value	B	95% CI		p-value
Adding TiO₂	−5	−38	29	0.771	−36	−52	− 20	< 0.001**
Without adding TiO₂	0				0			.
Exchange with ammonia solution	−1	−35	32	0.948	−38	−54	−23	< 0.001**
Without exchange with ammonia solution	0				0
Crosslinking degree (3%)	0				0
Crosslinking degree (5%)	−45	−86	−4	0.033*	−35	−54	−16	< 0.001**
Crosslinking degree (7%)	−22	−65	22	0.331	−27	−47	−7	0.009*
Adsorption capacity	0.2	−2	2	0.799	0.34	−0.75	1	0.540
Initial Cu²⁺ concentration (100 ppm)	0				0
Initial Cu²⁺ concentration (300 ppm)	79	39	120	< 0.001**	12	−5	30	0.177

B estimated factor, CI confidence interval, * statistically significant, ** highly statistically significant