condition mean min max ZT0-3 0.2515475 0.0 0.503095 ZT4-7 0.5070865 0.5070865 0.5070865 ZT8-11 0.341414 0.341414 0.341414 ZT12-15 0 0 0 ZT16-19 0.1647015 0.1647015 0.1647015 ZT20-23 0.4968785 0.4968785 0.4968785