condition mean min max ZT0-3 1979.0500000000002 1979.0500000000002 1979.0500000000002 ZT4-7 2681.9 2681.9 2681.9 ZT8-11 2802.4 2802.4 2802.4 ZT12-15 2227.55 2227.55 2227.55 ZT16-19 1691.45 1691.45 1691.45 ZT20-23 1851.3 1851.3 1851.3