1、选择偏倚(Selection bias) (2)选择偏倚的种类 >入院率偏倚(admission bias) >现患病例偏倚(Prevalence-incidence bias) >检出信号偏倚（detection signal bias) >无应答偏倚(loss to follow-up bias) （2）选择偏倚的种类 ➢入院率偏倚(admission bias) ➢现患病例偏倚(Prevalence -incidence bias) ➢检出信号偏倚（detection signal bias) ➢无应答偏倚(loss to follow-up bias) 1、选择偏倚(Selection bias)