condition mean min max ZT0-3 31.890375 27.479599999999998 36.30115 ZT4-7 40.4599 40.4599 40.4599 ZT8-11 67.76125 67.76125 67.76125 ZT12-15 0 0 0 ZT16-19 89.3454 89.3454 89.3454 ZT20-23 51.15315 51.15315 51.15315