condition mean min max ZT0-3 1.456655 1.456655 1.456655 ZT4-7 0.8127775 0.8127775 0.8127775 ZT8-11 0.8278175000000001 0.8278175000000001 0.8278175000000001 ZT12-15 0.7394035000000001 0.7394035000000001 0.7394035000000001 ZT16-19 2.2627699999999997 2.2627699999999997 2.2627699999999997 ZT20-23 1.45098 1.45098 1.45098