condition mean min max ZT0-3 0.435414 0.34557899999999997 0.5252490000000001 ZT4-7 0.35070599999999996 0.35070599999999996 0.35070599999999996 ZT8-11 0.5266925 0.5266925 0.5266925 ZT12-15 0 0 0 ZT16-19 0.3439405 0.3439405 0.3439405 ZT20-23 0.779622 0.779622 0.779622