condition mean min max ZT0-3 2491.95 2491.95 2491.95 ZT4-7 2207.1 2207.1 2207.1 ZT8-11 1819.9 1819.9 1819.9 ZT12-15 1387.6999999999998 1387.6999999999998 1387.6999999999998 ZT16-19 1458.8 1458.8 1458.8 ZT20-23 1944.3000000000002 1944.3000000000002 1944.3000000000002