Table 2 Mean surface roughness (Ra) values and standard deviations (SD) of the groups
From: Effects of laser treatments on surface roughness of zirconium oxide ceramics
Groups | N | Mean Ra (μm) | SD | P |
|---|---|---|---|---|
Group C | 6 | 0.102c | ,034 | p > .001 |
Group S | 6 | 0.876a | ,067 | p < .001 |
Group 150SP | 6 | 0.102c | ,023 | p > .001 |
Group 150SSP | 6 | 0.140c | ,035 | p > .001 |
Group 300SP | 6 | 0.110c | ,032 | p > .001 |
Group 300SSP | 6 | 0.121c | ,021 | p > .001 |
Group 3 W | 6 | 0.158c | ,030 | p > .001 |
Group 4 W | 6 | 0.622b | ,177 | p < .001 |
Total | 48 | 0.279 | ,290 |