condition mean min max ZT0-3 5.2403925000000005 5.077555 5.403230000000001 ZT4-7 4.60065 4.60065 4.60065 ZT8-11 5.08003 5.08003 5.08003 ZT12-15 0 0 0 ZT16-19 8.343795 8.343795 8.343795 ZT20-23 5.17729 5.17729 5.17729