condition mean min max ZT0-3 816.2358 816.2358 816.2358 ZT4-7 899.2877 899.2877 899.2877 ZT8-11 704.9295000000001 704.9295000000001 704.9295000000001 ZT12-15 795.7947333333333 795.7947333333333 795.7947333333333 ZT16-19 991.1519999999999 991.1519999999999 991.1519999999999 ZT20-23 1224.282 1224.282 1224.282