CO2 laser treatment | P-value | ||||||
---|---|---|---|---|---|---|---|
Baseline | After 1st | After 2nd | After 3rd | Baseline versus 1st | Baseline versus 2nd | Baseline versus 3rd | |
Zinc (mg/L) | 0.06 ± 0.04 | 0.07 ± 0.05 | 0.10 ± 0.09 | 0.07 ± 0.07 | NS | < 0.01 | NS |
Copper (mg/L) | 0.006 ± 0.006 | 0.006 ± 0.008 | 0.006 ± 0.007 | 0.005 ± 0.005 | NS | NS | NS |