condition mean min max ZT0-3 17.976200000000002 17.976200000000002 17.976200000000002 ZT4-7 15.0663 15.0663 15.0663 ZT8-11 25.3609 25.3609 25.3609 ZT12-15 23.98855 23.98855 23.98855 ZT16-19 23.1993 23.1993 23.1993 ZT20-23 19.1012 19.1012 19.1012