The probability is 18.5 % ( 95 % CI , 5.4 % -30.6 % ) that any lung cancer detected by screening with LDCT was an overdiagnosis , 22.5 % ( 95 % CI , 9.7 % -34.3 % ) that a non-small cell lung cancer detected by LDCT was an overdiagnosis , and 78.9 % ( 95 % CI , 62.2 % -93.5 % ) that a bronchioalveolar lung cancer detected by LDCT was an overdiagnosis .