condition mean min max ZT0-3 31.11025 22.75795 35.52945 ZT4-7 17.265 17.265 17.265 ZT8-11 11.44915 11.44915 11.44915 ZT12-15 14.290175 13.200099999999999 15.38025 ZT16-19 17.76145 17.76145 17.76145 ZT20-23 29.21105 29.21105 29.21105