condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.14199900000000001 0.14199900000000001 0.14199900000000001 ZT16-19 0.2509076666666667 0.2509076666666667 0.2509076666666667 ZT20-23 0.6271899999999999 0.6271899999999999 0.6271899999999999