condition mean min max ZT0-3 0.711507 0.711507 0.711507 ZT4-7 0.19563599999999998 0.19563599999999998 0.19563599999999998 ZT8-11 0.42526949999999997 0.42526949999999997 0.42526949999999997 ZT12-15 0.419725 0.419725 0.419725 ZT16-19 1.083145 1.083145 1.083145 ZT20-23 0.820339 0.820339 0.820339