condition mean min max ZT0-3 18.394083333333334 16.547400000000003 19.32995 ZT4-7 24.349 24.349 24.349 ZT8-11 3.75957 3.75957 3.75957 ZT12-15 7.486385 5.630330000000001 9.34244 ZT16-19 6.03102 6.03102 6.03102 ZT20-23 8.543165 8.543165 8.543165