condition mean min max ZT0-3 10.026407 10.026407 10.026407 ZT4-7 9.265158 9.265158 9.265158 ZT8-11 11.0595465 11.0595465 11.0595465 ZT12-15 10.75589 10.75589 10.75589 ZT16-19 10.592399 10.592399 10.592399 ZT20-23 10.1586875 10.1586875 10.1586875