99.997 th percentile; IQ 160 sd15, IQ 164 sd16
≥ 4 standard deviations above the mean
50th WIN member society (since 07/2015)
Four Sigma Korea(FSK) was founded on July 3, 2007 by Hankyung Lee, M.D, with the aim to gather the people who have high level of intelligence above IQ 196 sd24 or IQ 160 sd15 of the unselected adult population in Korea. FSK provides an intellectual private forums that FSK members are allowed to share ideas and opinions for intellectual life.