condition mean min max ZT0-3 0.3588441666666667 0.3563505 0.3621095 ZT4-7 0.0895995 0.0895995 0.0895995 ZT8-11 0.301196 0.301196 0.301196 ZT12-15 0.28789525000000005 0.0908385 0.48495200000000005 ZT16-19 0.2717975 0.2717975 0.2717975 ZT20-23 0.857001 0.857001 0.857001