The intervention did not reduce the incidence of tuberculosis , with rates of 3.02 per 100 person-years in the intervention clusters and 2.95 per 100 person-years in the control clusters ( rate ratio in the intervention clusters , 1.00 ; 95 % confidence interval [ CI ] , 0.75 to 1.34 ; P = 0.98 ; adjusted rate ratio , 0.96 ; 95 % CI , 0.76 to 1.21 ; P = 0.71 ) , or the prevalence of tuberculosis ( 2.35 % vs. 2.14 % ; adjusted prevalence ratio , 0.98 ; 95 % CI , 0.65 to 1.48 ; P = 0.90 ) .