condition mean min max ZT0-3 258.001288 258.001288 258.001288 ZT4-7 280.7525445 280.7525445 280.7525445 ZT8-11 263.572192 263.572192 263.572192 ZT12-15 190.082523 190.082523 190.082523 ZT16-19 218.26734199999999 218.26734199999999 218.26734199999999 ZT20-23 214.7102125 214.7102125 214.7102125