condition mean min max ZT0-3 10.116859999999999 10.116859999999999 10.116859999999999 ZT4-7 9.004475 9.004475 9.004475 ZT8-11 5.965669999999999 5.965669999999999 5.965669999999999 ZT12-15 7.56751 7.56751 7.56751 ZT16-19 8.037856666666666 8.037856666666666 8.037856666666666 ZT20-23 8.74865 8.74865 8.74865