condition mean min max ZT0-3 5.4272100000000005 5.4272100000000005 5.4272100000000005 ZT4-7 3.852885 3.852885 3.852885 ZT8-11 7.812844999999999 7.812844999999999 7.812844999999999 ZT12-15 9.783745 9.783745 9.783745 ZT16-19 9.92666 9.92666 9.92666 ZT20-23 7.63974 7.63974 7.63974