Table 2.

Results of the ZnO release from nanocomposites: (1) Student’s t-test for independent samples; (2) Cochran–Cox test with separate variance estimate test.

ZnO Release n = 5	2.5% Mean = 2.281 mg/L	5% Mean = 2.143 mg/L	7.5% Mean = 3.512 mg/L	ZnO NPs Layer Mean = 4.878 mg/L
0% Mean = 0.074 mg/L	t-value = −17.6349 p-value = 0.0000001 (1)	t separ. var. est. = −17.7763 p-value = 0.000056 (2)	t separ. var. est. = −9.45474 p-value = 0.000696 (2)	t separ. var. est. = −14.7328 p-value = 0.000123 (2)
2.5% Mean = 2.281 mg/L		t-value = 0.808668 p-value = 0.442089 (1)	t-value = −3.20249 p-value = 0.012565 (1)	t separ. var. est. = −7.43784 p-value = 0.000608 (2)
5% Mean = 2.143 mg/L			t-value = −3.58721 p-value = 0.007113 (1)	t separ. var. est. = −7.90201 p-value = 0.000522 (2)
7.5% Mean = 3.512 mg/L				t-value = −2.79621 p-value = 0.023334 (1)