condition mean min max ZT0-3 11.531099999999999 11.531099999999999 11.531099999999999 ZT4-7 7.858295 7.858295 7.858295 ZT8-11 3.9914050000000003 3.9914050000000003 3.9914050000000003 ZT12-15 6.953965 6.953965 6.953965 ZT16-19 8.91094 8.91094 8.91094 ZT20-23 12.837050000000001 12.837050000000001 12.837050000000001