condition mean min max ZT0-3 5.86186 5.86186 5.86186 ZT4-7 3.560205 3.560205 3.560205 ZT8-11 4.615489999999999 4.615489999999999 4.615489999999999 ZT12-15 5.856445 5.856445 5.856445 ZT16-19 8.218006666666668 8.218006666666668 8.218006666666668 ZT20-23 7.458480000000001 7.458480000000001 7.458480000000001