condition mean min max ZT0-3 68.451175 64.58895000000001 72.3134 ZT4-7 33.1453 33.1453 33.1453 ZT8-11 43.70375 43.70375 43.70375 ZT12-15 0 0 0 ZT16-19 69.08314999999999 69.08314999999999 69.08314999999999 ZT20-23 65.73864999999999 65.73864999999999 65.73864999999999