<qa>  What is standard?10 log10 xstandard3 n where x is a SMBG data point, standard is aM glucose value chosen to define the degree of metabolic control typically 100 mgdl, and n is the number of samples. BG values below 100mgdl cause the M-value to rise rapidly while BG values above 100 mgdl cause the M-value to rise more slowly. M-values less than 18 correspond to good metabolic control Schlichtkrull J 1965. 