condition mean min max ZT0-3 16.36605 16.36605 16.36605 ZT4-7 20.5053 20.5053 20.5053 ZT8-11 11.73715 11.73715 11.73715 ZT12-15 12.55565 12.55565 12.55565 ZT16-19 10.8198 10.8198 10.8198 ZT20-23 22.629550000000002 22.629550000000002 22.629550000000002