condition mean min max ZT0-3 254.34824999999998 251.98399999999998 256.7125 ZT4-7 331.04200000000003 331.04200000000003 331.04200000000003 ZT8-11 312.7025 312.7025 312.7025 ZT12-15 0 0 0 ZT16-19 393.26800000000003 393.26800000000003 393.26800000000003 ZT20-23 332.4175 332.4175 332.4175