condition mean min max ZT0-3 495.909024 495.909024 495.909024 ZT4-7 675.7576745 675.7576745 675.7576745 ZT8-11 759.7899655 759.7899655 759.7899655 ZT12-15 783.6340210000001 783.6340210000001 783.6340210000001 ZT16-19 595.659276 595.659276 595.659276 ZT20-23 582.839129 582.839129 582.839129