condition mean min max ZT0-3 1.1822038333333333 0.7869014999999999 1.478865 ZT4-7 2.893825 2.893825 2.893825 ZT8-11 4.064595 4.064595 4.064595 ZT12-15 3.6400775 3.5453099999999997 3.734845 ZT16-19 3.281835 3.281835 3.281835 ZT20-23 3.3771500000000003 3.3771500000000003 3.3771500000000003