condition mean min max ZT0-3 1.0427256666666667 0.8845125 1.327125 ZT4-7 0.9656405000000001 0.9656405000000001 0.9656405000000001 ZT8-11 0.3118285 0.3118285 0.3118285 ZT12-15 0.46757325000000005 0.414306 0.5208405 ZT16-19 0.47040950000000004 0.47040950000000004 0.47040950000000004 ZT20-23 0.6336165 0.6336165 0.6336165