condition mean min max ZT0-3 251.27466666666666 230.20850000000002 287.0915 ZT4-7 255.269 255.269 255.269 ZT8-11 330.001 330.001 330.001 ZT12-15 313.02625 313.01800000000003 313.0345 ZT16-19 292.0165 292.0165 292.0165 ZT20-23 206.6025 206.6025 206.6025