condition mean min max ZT0-3 31.512223333333335 5.02717 48.4896 ZT4-7 4.206795 4.206795 4.206795 ZT8-11 6.733735 6.733735 6.733735 ZT12-15 9.839185 8.956425 10.721945 ZT16-19 12.92145 12.92145 12.92145 ZT20-23 23.1323 23.1323 23.1323