I am using a latent class growth mixture model with mplus. I am using data from the longitudinal cohort. Data includes 6 different phases. I want BMI data after the onset of hypertension (outcome) were not included in analyses. For example when hypertension occurs in phase 2, I want to consider just BMI_baseline and BMI1, I mean BMI before outcome . I recorded BMI data after the onset of hypertension to 999 and I am using this command useobservation are BMI2 =/ 999 AND BMI3=/999 AND BMI4=/999 But with this command all participants with BMI=999 are removed from my analysis I don't want to delete participates I want to delete some data for some participates and keep my participates in analysis Would you mind please help me ?