Table 3.

Bonferroni's Multiple Comparison Test between different optical densities. Significance level is indicated by*.

Bonferroni's Multiple Comparison Test	Mean diff.	t	Significance P < 0.05	Summary	95% CI of diff
1A vs 2A	−5.790	2.369	No	ns	−13.93 to 2.352
1A vs 3A	−25.61	10.48	Yes	***	−33.75 to −17.47
1A vs 1B	−15.31	6.265	Yes	***	−23.46 to −7.172
1A vs 2B	−31.40	12.85	Yes	***	−39.54 to −23.26
1A vs 3B	−48.78	19.95	Yes	***	−56.92 to −40.63
2B vs 3B	−17.37	7.107	Yes	***	−25.52 to −9.232

2B vs 3B: T-test revealed that there is a significantly high increase in the OD of 3B compared to 2B with P value < 0.0001.