condition mean min max ZT0-3 34.369249999999994 33.17565 35.56285 ZT4-7 14.872499999999999 14.872499999999999 14.872499999999999 ZT8-11 9.260465 9.260465 9.260465 ZT12-15 0 0 0 ZT16-19 18.55835 18.55835 18.55835 ZT20-23 32.370850000000004 32.370850000000004 32.370850000000004