condition mean min max ZT0-3 182.934769 182.934769 182.934769 ZT4-7 417.5039395 417.5039395 417.5039395 ZT8-11 371.416866 371.416866 371.416866 ZT12-15 356.902901 356.902901 356.902901 ZT16-19 257.81384349999996 257.81384349999996 257.81384349999996 ZT20-23 207.55958049999998 207.55958049999998 207.55958049999998