condition mean min max ZT0-3 3.5901725000000004 3.0241100000000003 4.156235000000001 ZT4-7 2.415255 2.415255 2.415255 ZT8-11 0.9390945 0.9390945 0.9390945 ZT12-15 0 0 0 ZT16-19 1.9284999999999999 1.9284999999999999 1.9284999999999999 ZT20-23 3.0248749999999998 3.0248749999999998 3.0248749999999998