condition mean min max ZT0-3 2.0950024999999997 1.917125 2.27288 ZT4-7 2.8467450000000003 2.8467450000000003 2.8467450000000003 ZT8-11 4.185555 4.185555 4.185555 ZT12-15 0 0 0 ZT16-19 4.103585 4.103585 4.103585 ZT20-23 2.77348 2.77348 2.77348