condition mean min max ZT0-3 27.450000000000003 27.450000000000003 27.450000000000003 ZT4-7 34.5 34.5 34.5 ZT8-11 30.200000000000003 30.200000000000003 30.200000000000003 ZT12-15 21.25 21.25 21.25 ZT16-19 16.25 16.25 16.25 ZT20-23 34.8 34.8 34.8