condition mean min max ZT0-3 1972.8999999999999 1972.8999999999999 1972.8999999999999 ZT4-7 2220.0 2220.0 2220.0 ZT8-11 2711.8 2711.8 2711.8 ZT12-15 2524.8500000000004 2524.8500000000004 2524.8500000000004 ZT16-19 2284.8500000000004 2284.8500000000004 2284.8500000000004 ZT20-23 2209.55 2209.55 2209.55