condition mean min max ZT0-3 5.34521 5.34521 5.34521 ZT4-7 3.3293150000000002 3.3293150000000002 3.3293150000000002 ZT8-11 4.05235 4.05235 4.05235 ZT12-15 5.180175 5.180175 5.180175 ZT16-19 6.326155 6.326155 6.326155 ZT20-23 6.670045 6.670045 6.670045