condition mean min max ZT0-3 0.09821825 0.0970125 0.09942400000000001 ZT4-7 0.26873625 0.26873625 0.26873625 ZT8-11 0.334119 0.334119 0.334119 ZT12-15 0 0 0 ZT16-19 0.39102400000000004 0.39102400000000004 0.39102400000000004 ZT20-23 0.22903400000000002 0.22903400000000002 0.22903400000000002