condition mean min max ZT0-3 10.4822875 9.596070000000001 11.368504999999999 ZT4-7 9.466695000000001 9.466695000000001 9.466695000000001 ZT8-11 8.21219 8.21219 8.21219 ZT12-15 0 0 0 ZT16-19 8.592965 8.592965 8.592965 ZT20-23 8.15726 8.15726 8.15726