condition mean min max ZT0-3 2.6390399999999996 1.86727 3.4108099999999997 ZT4-7 4.469305 4.469305 4.469305 ZT8-11 9.715955000000001 9.715955000000001 9.715955000000001 ZT12-15 0 0 0 ZT16-19 4.099575 4.099575 4.099575 ZT20-23 3.216545 3.216545 3.216545