condition mean min max ZT0-3 4.98407 4.98407 4.98407 ZT4-7 4.990365 4.990365 4.990365 ZT8-11 5.377325000000001 5.377325000000001 5.377325000000001 ZT12-15 6.408355 6.408355 6.408355 ZT16-19 4.892486666666667 4.892486666666667 4.892486666666667 ZT20-23 6.3657900000000005 6.3657900000000005 6.3657900000000005