condition mean min max ZT0-3 8.348512500000002 8.339605 8.357420000000001 ZT4-7 8.48003 8.48003 8.48003 ZT8-11 10.4657 10.4657 10.4657 ZT12-15 0 0 0 ZT16-19 14.215250000000001 14.215250000000001 14.215250000000001 ZT20-23 10.831900000000001 10.831900000000001 10.831900000000001