condition mean min max ZT0-3 0.6556589907499999 0.3562551085 0.9550628729999999 ZT4-7 0.6732555065 0.48472393449999995 0.8617870785 ZT8-11 1.5065948489999998 0.877482125 2.135707573 ZT12-15 5.9397694452500005 4.3692174065 7.510321484 ZT16-19 12.120904000749999 10.235655121499999 14.00615288 ZT20-23 19.8122868675 15.815984069999999 23.808589665