condition mean min max ZT0-3 389.580414 389.580414 389.580414 ZT4-7 419.485077 419.485077 419.485077 ZT8-11 518.526852 518.526852 518.526852 ZT12-15 460.15482199999997 460.15482199999997 460.15482199999997 ZT16-19 560.1829319999999 560.1829319999999 560.1829319999999 ZT20-23 470.066486 470.066486 470.066486