condition mean min max ZT0-3 10.5 10.5 10.5 ZT4-7 67.0 67.0 67.0 ZT8-11 9.0 9.0 9.0 ZT12-15 40.35 40.35 40.35 ZT16-19 59.150000000000006 59.150000000000006 59.150000000000006 ZT20-23 38.75 38.75 38.75