condition mean min max ZT0-3 26.75 26.75 26.75 ZT4-7 7.7 7.7 7.7 ZT8-11 17.200000000000003 17.200000000000003 17.200000000000003 ZT12-15 23.950000000000003 23.950000000000003 23.950000000000003 ZT16-19 45.8 45.8 45.8 ZT20-23 16.25 16.25 16.25