condition mean min max ZT0-3 17.031474 17.031474 17.031474 ZT4-7 16.5293385 16.5293385 16.5293385 ZT8-11 21.6106415 21.6106415 21.6106415 ZT12-15 16.1042795 16.1042795 16.1042795 ZT16-19 19.706030499999997 19.706030499999997 19.706030499999997 ZT20-23 17.6662455 17.6662455 17.6662455