condition mean min max ZT0-3 3.70445 0.453979 7.690626 ZT4-7 3.924175 3.924175 3.924175 ZT8-11 3.73934 3.73934 3.73934 ZT12-15 5.41173 4.416335 6.407125000000001 ZT16-19 2.85214 2.85214 2.85214 ZT20-23 5.54453 5.54453 5.54453