condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.01921495 0.01921495 0.01921495 ZT8-11 0.03137895 0.03137895 0.03137895 ZT12-15 0.044579 0.044579 0.044579 ZT16-19 0.01674835 0.01674835 0.01674835 ZT20-23 0.041817450000000006 0.041817450000000006 0.041817450000000006