condition mean min max ZT0-3 37.150000000000006 37.150000000000006 37.150000000000006 ZT4-7 9.8 9.8 9.8 ZT8-11 18.0 18.0 18.0 ZT12-15 23.9 23.9 23.9 ZT16-19 57.3 57.3 57.3 ZT20-23 28.25 28.25 28.25