condition mean min max ZT0-3 6.0470975000000005 5.959585000000001 6.13461 ZT4-7 5.17783 5.17783 5.17783 ZT8-11 3.1896899999999997 3.1896899999999997 3.1896899999999997 ZT12-15 0 0 0 ZT16-19 7.741135 7.741135 7.741135 ZT20-23 7.808495000000001 7.808495000000001 7.808495000000001