highly significantP < 0·001
This was highly significant ( P < 0·001) and was more effective for thin than for thick AKs ( P < 0·001), as has been noted with most other therapies, including PDT. 15 , 16 Our study included hyperkeratotic AKs and acral sites, both of which are associated with higher rates of treatment failure. 6 , 17 AKs larger than the microwave probe diameter were not excluded in this study.