condition mean min max ZT0-3 23.525068225 13.77494529 33.27519116 ZT4-7 34.4374964875 33.042315294999995 35.83267768 ZT8-11 41.59540769 36.82626078 46.3645546 ZT12-15 67.01566371 61.297300945 72.734026475 ZT16-19 69.05187386 62.500558375 75.603189345 ZT20-23 48.6348878 42.69066563 54.579109970000005