condition mean min max ZT0-3 135.217663 135.217663 135.217663 ZT4-7 105.841823 105.841823 105.841823 ZT8-11 134.044795 134.044795 134.044795 ZT12-15 145.807704 145.807704 145.807704 ZT16-19 144.6286485 144.6286485 144.6286485 ZT20-23 119.3455215 119.3455215 119.3455215