condition mean min max ZT0-3 139.485918 139.485918 139.485918 ZT4-7 34.953664 34.953664 34.953664 ZT8-11 26.012328500000002 26.012328500000002 26.012328500000002 ZT12-15 37.3558775 37.3558775 37.3558775 ZT16-19 86.7979625 86.7979625 86.7979625 ZT20-23 118.62049049999999 118.62049049999999 118.62049049999999