condition mean min max ZT0-3 286.698132 286.698132 286.698132 ZT4-7 234.25178400000001 234.25178400000001 234.25178400000001 ZT8-11 209.13126499999998 209.13126499999998 209.13126499999998 ZT12-15 197.9089795 197.9089795 197.9089795 ZT16-19 134.979926 134.979926 134.979926 ZT20-23 113.41008149999999 113.41008149999999 113.41008149999999