<qa>  How many patients were smokers?Study Design This study utilized a randomized, controlled, double-blind, parallel-group design to investigate the 6-month effect of a cyclic regimen of diclofenac potassium 50 mg, twice daily b.i.d on clinical parameters of periodontal disease and levels of PGE2 and IL-1beta in GCF. After clinical and radiographic examination, subjects were divided into two groups: 28 patients in the test group and 13 patients in the control group. Of the 28 patients in the test group, ten nine men, one woman were smokers, eleven six women, five men were non-smokers, and seven all men were ex-smokers. Thirteen patients in the control group comprised six smokers five men, one woman, five non-smokers four women, one man and two ex-smokers both men. 