condition mean min max ZT0-3 1120.6 1120.6 1120.6 ZT4-7 1984.6 1984.6 1984.6 ZT8-11 2033.1999999999998 2033.1999999999998 2033.1999999999998 ZT12-15 1898.6 1898.6 1898.6 ZT16-19 1344.8000000000002 1344.8000000000002 1344.8000000000002 ZT20-23 1127.55 1127.55 1127.55