condition mean min max ZT0-3 28.036394996 8.820644372 47.25214562 ZT4-7 80.526829865 79.204004 81.84965573 ZT8-11 57.467364285 45.90563649 69.02909208 ZT12-15 8.96927634025 3.402574145 14.5359785355 ZT16-19 7.97646998725 6.852041895499999 9.100898079 ZT20-23 7.262554324250001 5.6094120845 8.915696564000001