condition mean min max ZT0-3 10.393325 10.393325 10.393325 ZT4-7 10.57198 10.57198 10.57198 ZT8-11 9.259026500000001 9.259026500000001 9.259026500000001 ZT12-15 8.7522075 8.7522075 8.7522075 ZT16-19 8.7998255 8.7998255 8.7998255 ZT20-23 11.295555 11.295555 11.295555