condition mean min max ZT0-3 1.2203885 1.2203885 1.2203885 ZT4-7 2.1251100000000003 2.1251100000000003 2.1251100000000003 ZT8-11 1.152473 1.152473 1.152473 ZT12-15 3.593705 3.593705 3.593705 ZT16-19 3.937035 3.937035 3.937035 ZT20-23 2.989945 2.989945 2.989945