condition mean min max ZT0-3 10.6968025 10.359855 11.03375 ZT4-7 7.74664 7.74664 7.74664 ZT8-11 5.5703 5.5703 5.5703 ZT12-15 0 0 0 ZT16-19 7.627255 7.627255 7.627255 ZT20-23 8.753655 8.753655 8.753655