condition mean min max ZT0-3 7.819245 7.480639999999999 8.15785 ZT4-7 6.83247 6.83247 6.83247 ZT8-11 12.88255 12.88255 12.88255 ZT12-15 0 0 0 ZT16-19 14.2135 14.2135 14.2135 ZT20-23 9.528055 9.528055 9.528055