condition mean min max ZT0-3 0.3065945 0.3065945 0.3065945 ZT4-7 0.0 0.0 0.0 ZT8-11 0.1058225 0.1058225 0.1058225 ZT12-15 0.0 0.0 0.0 ZT16-19 0.1711305 0.1711305 0.1711305 ZT20-23 0.0422681 0.0422681 0.0422681