condition mean min max ZT0-3 6248.51 6248.51 6248.51 ZT4-7 6678.46 6678.46 6678.46 ZT8-11 4383.915000000001 4383.915000000001 4383.915000000001 ZT12-15 2143.26 2143.26 2143.26 ZT16-19 2388.9700000000003 2388.9700000000003 2388.9700000000003 ZT20-23 4758.515 4758.515 4758.515