Hie Anything less than 5% for missing and flagged values is good and anything below 10% is acceptable. Regards

If ... (1) The data are from a population survey rather than (e.g.) a SAM patient cohort. (2) Survey staff were well trained in weighing, measuring, and recording. (3) You have done double-entry, followed by one or more validation, correction, validation cycles. (4) You have corrected obvious errors (e.g. misplaced decimal points) or censored records with clearly faulty data. (5) You are using sensible default flagging criteria (software defaults in ENA and EpiInfo could be used ... then you should see very few flagged records. From my own surveys, I cannot recall this ever being more than about a dozen records in sampling sizes of 700 or more (i.e. less than about 2%) for WHZ. You may see more than this for HAZ or WAZ because it is common to have large errors in age. In any case, you should check flagged records against paper records as falling may be due to copying errors or miskeying of data. I hope this helps.