condition mean min max ZT0-3 2.4542425 2.158785 2.7497 ZT4-7 3.878405 3.878405 3.878405 ZT8-11 7.332750000000001 7.332750000000001 7.332750000000001 ZT12-15 0 0 0 ZT16-19 3.099915 3.099915 3.099915 ZT20-23 3.143415 3.143415 3.143415