condition mean min max ZT0-3 2664.3 2664.3 2664.3 ZT4-7 2634.9 2634.9 2634.9 ZT8-11 1980.6 1980.6 1980.6 ZT12-15 1387.55 1387.55 1387.55 ZT16-19 1773.8999999999999 1773.8999999999999 1773.8999999999999 ZT20-23 1984.6000000000001 1984.6000000000001 1984.6000000000001