condition mean min max ZT0-3 2.99993 2.751055 3.248805 ZT4-7 4.758085 4.758085 4.758085 ZT8-11 5.378105 5.378105 5.378105 ZT12-15 0 0 0 ZT16-19 4.915475000000001 4.915475000000001 4.915475000000001 ZT20-23 5.0999300000000005 5.0999300000000005 5.0999300000000005