condition mean min max ZT0-3 3.8586549999999997 3.3800749999999997 4.337235 ZT4-7 4.1064 4.1064 4.1064 ZT8-11 3.4814499999999997 3.4814499999999997 3.4814499999999997 ZT12-15 0 0 0 ZT16-19 4.32996 4.32996 4.32996 ZT20-23 4.13594 4.13594 4.13594