condition mean min max ZT0-3 40.047625 38.585449999999994 41.5098 ZT4-7 36.51975 36.51975 36.51975 ZT8-11 44.59585 44.59585 44.59585 ZT12-15 0 0 0 ZT16-19 59.459450000000004 59.459450000000004 59.459450000000004 ZT20-23 51.5564 51.5564 51.5564