condition mean min max ZT0-3 43.55305 43.55305 43.55305 ZT4-7 34.9976 34.9976 34.9976 ZT8-11 26.32275 26.32275 26.32275 ZT12-15 20.7765 20.7765 20.7765 ZT16-19 40.72565 40.72565 40.72565 ZT20-23 42.8642 42.8642 42.8642