condition mean min max ZT0-3 0.3831019 0.24683080000000002 0.519373 ZT4-7 0.3840595 0.3840595 0.3840595 ZT8-11 0.2710455 0.2710455 0.2710455 ZT12-15 0 0 0 ZT16-19 0.8218565 0.8218565 0.8218565 ZT20-23 0.5132495 0.5132495 0.5132495