condition mean min max ZT0-3 39.497341 39.497341 39.497341 ZT4-7 61.279694500000005 61.279694500000005 61.279694500000005 ZT8-11 67.327657 67.327657 67.327657 ZT12-15 78.596001 78.596001 78.596001 ZT16-19 70.746588 70.746588 70.746588 ZT20-23 62.7960765 62.7960765 62.7960765