condition mean min max ZT0-3 13.25670054325 12.5565644065 13.95683668 ZT4-7 6.064966275250001 4.863888729 7.2660438215 ZT8-11 5.7906418055 3.837750454 7.743533157 ZT12-15 7.88725275525 7.3369798594999995 8.437525651 ZT16-19 8.89993052 8.326997070000001 9.472863969999999 ZT20-23 9.91496279375 9.4122822025 10.417643385