condition mean min max ZT0-3 0.26245728333333335 0.19479435 0.33346750000000003 ZT4-7 0.1428682 0.1428682 0.1428682 ZT8-11 0.255824 0.255824 0.255824 ZT12-15 0.377505 0.3707825 0.3842275 ZT16-19 0.381396 0.381396 0.381396 ZT20-23 0.3120095 0.3120095 0.3120095