condition mean min max ZT0-3 86.107921 86.107921 86.107921 ZT4-7 91.5573715 91.5573715 91.5573715 ZT8-11 66.704293 66.704293 66.704293 ZT12-15 50.291040499999994 50.291040499999994 50.291040499999994 ZT16-19 29.576614999999997 29.576614999999997 29.576614999999997 ZT20-23 21.257451 21.257451 21.257451