condition mean min max ZT0-3 1652.782743 1652.782743 1652.782743 ZT4-7 2192.5617525 2192.5617525 2192.5617525 ZT8-11 1763.853982 1763.853982 1763.853982 ZT12-15 1393.801998 1393.801998 1393.801998 ZT16-19 2028.537712 2028.537712 2028.537712 ZT20-23 2963.4916255 2963.4916255 2963.4916255