condition mean min max ZT0-3 2960.552739 2960.552739 2960.552739 ZT4-7 2533.8759215 2533.8759215 2533.8759215 ZT8-11 957.830493 957.830493 957.830493 ZT12-15 1090.3592885 1090.3592885 1090.3592885 ZT16-19 189.722433 189.722433 189.722433 ZT20-23 136.982068 136.982068 136.982068