condition mean min max ZT0-3 0.48748749999999996 0.400279 0.574696 ZT4-7 0.7030605 0.7030605 0.7030605 ZT8-11 0.1003222 0.1003222 0.1003222 ZT12-15 0 0 0 ZT16-19 0.39307499999999995 0.39307499999999995 0.39307499999999995 ZT20-23 0.49472150000000004 0.49472150000000004 0.49472150000000004