condition mean min max ZT0-3 0.4988266666666667 0.0 1.49648 ZT4-7 1.42446 1.42446 1.42446 ZT8-11 1.442325 1.442325 1.442325 ZT12-15 1.60028 0.0 3.20056 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0 0.0 0.0