condition mean min max ZT0-3 253.10000000000002 253.10000000000002 253.10000000000002 ZT4-7 136.2 136.2 136.2 ZT8-11 142.35 142.35 142.35 ZT12-15 136.1 136.1 136.1 ZT16-19 188.55 188.55 188.55 ZT20-23 248.5 248.5 248.5