condition mean min max ZT0-3 34.296142 34.296142 34.296142 ZT4-7 55.4127385 55.4127385 55.4127385 ZT8-11 61.971538499999994 61.971538499999994 61.971538499999994 ZT12-15 44.213295 44.213295 44.213295 ZT16-19 39.565433 39.565433 39.565433 ZT20-23 26.6802155 26.6802155 26.6802155