condition mean min max ZT0-3 1.656165 1.480275 1.832055 ZT4-7 3.231115 3.231115 3.231115 ZT8-11 3.9224500000000004 3.9224500000000004 3.9224500000000004 ZT12-15 0 0 0 ZT16-19 4.366965 4.366965 4.366965 ZT20-23 2.81292 2.81292 2.81292