condition mean min max ZT0-3 1455.828192 1455.828192 1455.828192 ZT4-7 1230.5461965 1230.5461965 1230.5461965 ZT8-11 1301.7540665 1301.7540665 1301.7540665 ZT12-15 1357.8308065 1357.8308065 1357.8308065 ZT16-19 1442.7393465 1442.7393465 1442.7393465 ZT20-23 1566.5218635 1566.5218635 1566.5218635