TY - GEN AU - Blomqvist,N TI - On the bias caused by regression toward the mean in studying the relation between change and initial value SN - 0303-6979 PY - 1987///0318 KW - Epithelial Attachment KW - pathology KW - Humans KW - Periodontal Pocket KW - Periodontitis KW - Regression Analysis KW - Research Design N1 - Publication Type: Journal Article UR - https://doi.org/10.1111/j.1600-051x.1987.tb01510.x ER -