condition mean min max ZT0-3 462.837674 462.837674 462.837674 ZT4-7 512.9880175000001 512.9880175000001 512.9880175000001 ZT8-11 451.7861145 451.7861145 451.7861145 ZT12-15 501.302739 501.302739 501.302739 ZT16-19 973.4931855 973.4931855 973.4931855 ZT20-23 821.7837724999999 821.7837724999999 821.7837724999999