condition mean min max ZT0-3 211.88316666666665 197.3245 224.4765 ZT4-7 227.27550000000002 227.27550000000002 227.27550000000002 ZT8-11 250.0455 250.0455 250.0455 ZT12-15 283.28775 247.779 318.79650000000004 ZT16-19 331.306 331.306 331.306 ZT20-23 228.358 228.358 228.358