condition mean min max ZT0-3 4.559768793250001 4.064097333 5.0554402535000005 ZT4-7 8.099813253 7.7363621385 8.4632643675 ZT8-11 7.381950679499999 5.3573060355 9.4065953235 ZT12-15 12.7407702875 10.754468025000001 14.727072549999999 ZT16-19 19.66806424 18.381411094999997 20.954717385000002 ZT20-23 21.3084465025 20.253650880000002 22.363242125