condition mean min max ZT0-3 0.797204 0.797204 0.797204 ZT4-7 0.7539845000000001 0.7539845000000001 0.7539845000000001 ZT8-11 0.9167449999999999 0.9167449999999999 0.9167449999999999 ZT12-15 0.7977015000000001 0.7977015000000001 0.7977015000000001 ZT16-19 0.8672666666666666 0.8672666666666666 0.8672666666666666 ZT20-23 1.2666600000000001 1.2666600000000001 1.2666600000000001