condition mean min max ZT0-3 576.999964 576.999964 576.999964 ZT4-7 276.9478625 276.9478625 276.9478625 ZT8-11 203.68363799999997 203.68363799999997 203.68363799999997 ZT12-15 248.2012475 248.2012475 248.2012475 ZT16-19 310.2004415 310.2004415 310.2004415 ZT20-23 379.966208 379.966208 379.966208