condition mean min max ZT0-3 152.72825905 144.726553 160.7299651 ZT4-7 155.8077611 152.00639759999999 159.6091246 ZT8-11 187.40858578333334 180.27978183333332 194.53738973333336 ZT12-15 304.5427678 286.29555600000003 322.7899796 ZT16-19 268.00702390000004 258.1330178 277.88103 ZT20-23 237.95275403333335 215.64889966666667 260.2566084