condition mean min max ZT0-3 1.3949495 1.219819 1.57008 ZT4-7 2.06519 2.06519 2.06519 ZT8-11 2.97626 2.97626 2.97626 ZT12-15 0 0 0 ZT16-19 3.4940949999999997 3.4940949999999997 3.4940949999999997 ZT20-23 2.73693 2.73693 2.73693