condition mean min max ZT0-3 255.814169 255.814169 255.814169 ZT4-7 139.06115549999998 139.06115549999998 139.06115549999998 ZT8-11 18.075526 18.075526 18.075526 ZT12-15 17.639379 17.639379 17.639379 ZT16-19 9.785925500000001 9.785925500000001 9.785925500000001 ZT20-23 9.4495565 9.4495565 9.4495565