condition mean min max ZT0-3 44.764613325 21.88685751 67.64236914 ZT4-7 197.13639805000003 144.47525395 249.79754215000003 ZT8-11 508.92109752500005 422.25240155 595.5897935 ZT12-15 794.1305548 737.77371185 850.48739775 ZT16-19 507.76534014999993 420.58372885 594.9469514499999 ZT20-23 249.8596383 204.01467780000002 295.7045988