condition mean min max ZT0-3 0.23299623333333333 0.120966 0.29757 ZT4-7 0.11316645 0.11316645 0.11316645 ZT8-11 0.3474755 0.3474755 0.3474755 ZT12-15 0.4720415 0.44642950000000003 0.49765349999999997 ZT16-19 0.3321685 0.3321685 0.3321685 ZT20-23 0.4006225 0.4006225 0.4006225