condition mean min max ZT0-3 0.6029813333333334 0.519181 0.6652715 ZT4-7 0.5183245 0.5183245 0.5183245 ZT8-11 0.699688 0.699688 0.699688 ZT12-15 1.6728 1.425665 1.9199350000000002 ZT16-19 1.212305 1.212305 1.212305 ZT20-23 1.1822300000000001 1.1822300000000001 1.1822300000000001