condition mean min max ZT0-3 4.94757363825 4.3136110035 5.581536272999999 ZT4-7 3.1858836459999997 2.7660249605 3.6057423314999997 ZT8-11 4.23985273975 4.2164014640000005 4.263304015499999 ZT12-15 7.679610639 7.1567427595 8.2024785185 ZT16-19 5.8191515979999995 5.582610012 6.055693184 ZT20-23 6.440703227 5.41388909 7.467517364000001