condition mean min max ZT0-3 0.44801066666666667 0.077265 0.7980955 ZT4-7 0.078368 0.078368 0.078368 ZT8-11 0.2386565 0.2386565 0.2386565 ZT12-15 0.46773625 0.417805 0.5176675000000001 ZT16-19 0.3021285 0.3021285 0.3021285 ZT20-23 0.3470055 0.3470055 0.3470055