condition mean min max ZT0-3 205.5 205.5 205.5 ZT4-7 371.2 371.2 371.2 ZT8-11 385.2 385.2 385.2 ZT12-15 286.75 286.75 286.75 ZT16-19 161.85000000000002 161.85000000000002 161.85000000000002 ZT20-23 222.2 222.2 222.2