condition mean min max ZT0-3 54.150000000000006 54.150000000000006 54.150000000000006 ZT4-7 27.9 27.9 27.9 ZT8-11 21.0 21.0 21.0 ZT12-15 28.55 28.55 28.55 ZT16-19 23.15 23.15 23.15 ZT20-23 26.25 26.25 26.25