condition mean min max ZT0-3 0.540700867 0.403547693 0.677854041 ZT4-7 2.14944718775 1.5460613109999999 2.7528330645000003 ZT8-11 7.630639186 5.3035058925 9.957772479499999 ZT12-15 9.545677204499999 8.848629889 10.24272452 ZT16-19 8.733935876499999 8.384865256 9.083006497 ZT20-23 8.403046338500001 7.9483465025 8.8577461745