condition mean min max ZT0-3 200.52278189999998 142.99265369999998 258.05291009999996 ZT4-7 271.0969424 222.19847900000002 319.9954058 ZT8-11 357.15874555 287.61444995 426.70304115 ZT12-15 491.3838561 431.94379295000005 550.82391925 ZT16-19 238.8247255 205.02818575 272.62126524999996 ZT20-23 132.610579075 116.04041624999999 149.18074190000002