condition mean min max ZT0-3 69.37345 69.37345 69.37345 ZT4-7 58.5633 58.5633 58.5633 ZT8-11 58.46285 58.46285 58.46285 ZT12-15 43.25375 43.25375 43.25375 ZT16-19 66.06865 66.06865 66.06865 ZT20-23 67.25325000000001 67.25325000000001 67.25325000000001